SentryError: An event processor returned null, will not send event

[xpicio]

Hello, in our web application based on vue 2.6.12 and @sentry/vue 6.10.0 client SDK (we tried even with 6.11.0) we facing with the following error:

Sentry Logger [Error]: SentryError: An event processor returned null, will not send event.

Debugging a little bit the application i extracted the sentry event object that cause the error:

{
    "exception": {
        "values": [
            {
                "type": "TypeError",
                "value": "Cannot read property 'unitName' of undefined",
                "stacktrace": {
                    "frames": [
                        {
                            "colno": 9,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "createElm",
                            "in_app": true,
                            "lineno": 15783
                        },
                        {
                            "colno": 9,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "createComponent",
                            "in_app": true,
                            "lineno": 15836
                        },
                        {
                            "colno": 13,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "init",
                            "in_app": true,
                            "lineno": 12977
                        },
                        {
                            "colno": 16,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "VueComponent.webpackJsonp.7+uW.Vue.$mount",
                            "in_app": true,
                            "lineno": 21801
                        },
                        {
                            "colno": 10,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "VueComponent.webpackJsonp.7+uW.Vue.$mount",
                            "in_app": true,
                            "lineno": 18904
                        },
                        {
                            "colno": 3,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "mountComponent",
                            "in_app": true,
                            "lineno": 13931
                        },
                        {
                            "colno": 12,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "new Watcher",
                            "in_app": true,
                            "lineno": 14326
                        },
                        {
                            "colno": 25,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "Watcher.get",
                            "in_app": true,
                            "lineno": 14337
                        },
                        {
                            "colno": 10,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "VueComponent.updateComponent",
                            "in_app": true,
                            "lineno": 13924
                        },
                        {
                            "colno": 19,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "VueComponent.Vue._update",
                            "in_app": true,
                            "lineno": 13803
                        },
                        {
                            "colno": 7,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "VueComponent.patch [as __patch__]",
                            "in_app": true,
                            "lineno": 16331
                        },
                        {
                            "colno": 9,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "createElm",
                            "in_app": true,
                            "lineno": 15783
                        },
                        {
                            "colno": 9,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "createComponent",
                            "in_app": true,
                            "lineno": 15836
                        },
                        {
                            "colno": 13,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "init",
                            "in_app": true,
                            "lineno": 12977
                        },
                        {
                            "colno": 16,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "VueComponent.webpackJsonp.7+uW.Vue.$mount",
                            "in_app": true,
                            "lineno": 21801
                        },
                        {
                            "colno": 10,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "VueComponent.webpackJsonp.7+uW.Vue.$mount",
                            "in_app": true,
                            "lineno": 18904
                        },
                        {
                            "colno": 3,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "mountComponent",
                            "in_app": true,
                            "lineno": 13931
                        },
                        {
                            "colno": 12,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "new Watcher",
                            "in_app": true,
                            "lineno": 14326
                        },
                        {
                            "colno": 25,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "Watcher.get",
                            "in_app": true,
                            "lineno": 14337
                        },
                        {
                            "colno": 10,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "VueComponent.updateComponent",
                            "in_app": true,
                            "lineno": 13924
                        },
                        {
                            "colno": 19,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "VueComponent.Vue._update",
                            "in_app": true,
                            "lineno": 13803
                        },
                        {
                            "colno": 7,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "VueComponent.patch [as __patch__]",
                            "in_app": true,
                            "lineno": 16331
                        },
                        {
                            "colno": 9,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "createElm",
                            "in_app": true,
                            "lineno": 15812
                        },
                        {
                            "colno": 9,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "createChildren",
                            "in_app": true,
                            "lineno": 15911
                        },
                        {
                            "colno": 9,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "createElm",
                            "in_app": true,
                            "lineno": 15783
                        },
                        {
                            "colno": 9,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "createComponent",
                            "in_app": true,
                            "lineno": 15836
                        },
                        {
                            "colno": 13,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "init",
                            "in_app": true,
                            "lineno": 12977
                        },
                        {
                            "colno": 16,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "VueComponent.webpackJsonp.7+uW.Vue.$mount",
                            "in_app": true,
                            "lineno": 21801
                        },
                        {
                            "colno": 10,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "VueComponent.webpackJsonp.7+uW.Vue.$mount",
                            "in_app": true,
                            "lineno": 18904
                        },
                        {
                            "colno": 3,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "mountComponent",
                            "in_app": true,
                            "lineno": 13931
                        },
                        {
                            "colno": 12,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "new Watcher",
                            "in_app": true,
                            "lineno": 14326
                        },
                        {
                            "colno": 25,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "Watcher.get",
                            "in_app": true,
                            "lineno": 14337
                        },
                        {
                            "colno": 10,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "VueComponent.updateComponent",
                            "in_app": true,
                            "lineno": 13924
                        },
                        {
                            "colno": 19,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "VueComponent.Vue._update",
                            "in_app": true,
                            "lineno": 13803
                        },
                        {
                            "colno": 7,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "VueComponent.patch [as __patch__]",
                            "in_app": true,
                            "lineno": 16331
                        },
                        {
                            "colno": 9,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "createElm",
                            "in_app": true,
                            "lineno": 15783
                        },
                        {
                            "colno": 9,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "createComponent",
                            "in_app": true,
                            "lineno": 15836
                        },
                        {
                            "colno": 13,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "init",
                            "in_app": true,
                            "lineno": 12977
                        },
                        {
                            "colno": 16,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "VueComponent.webpackJsonp.7+uW.Vue.$mount",
                            "in_app": true,
                            "lineno": 21801
                        },
                        {
                            "colno": 10,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "VueComponent.webpackJsonp.7+uW.Vue.$mount",
                            "in_app": true,
                            "lineno": 18904
                        },
                        {
                            "colno": 3,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "mountComponent",
                            "in_app": true,
                            "lineno": 13931
                        },
                        {
                            "colno": 12,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "new Watcher",
                            "in_app": true,
                            "lineno": 14326
                        },
                        {
                            "colno": 25,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "Watcher.get",
                            "in_app": true,
                            "lineno": 14337
                        },
                        {
                            "colno": 21,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "VueComponent.updateComponent",
                            "in_app": true,
                            "lineno": 13924
                        },
                        {
                            "colno": 22,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "VueComponent.Vue._render",
                            "in_app": true,
                            "lineno": 13406
                        },
                        {
                            "colno": 21,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "VueComponent.render",
                            "in_app": true,
                            "lineno": 75431
                        },
                        {
                            "colno": 47,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "VueComponent.content",
                            "in_app": true,
                            "lineno": 75462
                        },
                        {
                            "colno": 37,
                            "filename": "https://uwa.demo.com/static/js/vendor.d72430d2f3abd7aae0a9.js",
                            "function": "Object.normalized [as Life]",
                            "in_app": true,
                            "lineno": 12449
                        },
                        {
                            "colno": 2114,
                            "filename": "https://uwa.demo.com/static/js/63.3a66cb6d6dcc5e556a5f.js",
                            "function": "fn",
                            "in_app": true,
                            "lineno": 890
                        },
                        {
                            "colno": 19,
                            "filename": "https://uwa.demo.com/static/js/63.3a66cb6d6dcc5e556a5f.js",
                            "function": "VueComponent.getMeasurementUnit",
                            "in_app": true,
                            "lineno": 643
                        }
                    ]
                },
                "mechanism": {
                    "handled": true,
                    "type": "generic"
                }
            }
        ]
    },
    "level": "error",
    "event_id": "f8d95a0b6a434a00b8035c8aab03d5ad",
    "platform": "javascript",
    "timestamp": 1630337380.814,
    "environment": "prod",
    "release": "v2.11.3",
    "sdk": {
        "integrations": [
            "InboundFilters",
            "FunctionToString",
            "TryCatch",
            "Breadcrumbs",
            "GlobalHandlers",
            "LinkedErrors",
            "Dedupe",
            "UserAgent"
        ],
        "name": "sentry.javascript.vue",
        "version": "6.10.0",
        "packages": [
            {
                "name": "npm:@sentry/vue",
                "version": "6.10.0"
            }
        ]
    },
    "user": {
        "id": "ckmloszb91an50n9pjjb0xejx",
        "email": "a@user.com"
    },
    "contexts": {
        "vue": {
            "componentName": "<RLTableCell>",
            "lifecycleHook": "render",
            "trace": "\n\nfound in\n\n---> <RLTableCell>\n       <VtTableCell>\n         <RLTableRow>\n           <VtTableRow>\n             <RLTableBody>\n               <VtTableBody>\n                 <RLTable>\n                   <VtTable>\n                     <RLClientTable>\n                       <VtClientTable>\n                         <CardPanel>\n                           <ToolingGrid>\n                             <Anonymous>\n                               <DefaultLayout>\n                                 <App>\n                                   <Root>",
            "propsData": {
                "column": "Life"
            }
        }
    },
    "breadcrumbs": [
        {
            "timestamp": 1630337324.111,
            "category": "navigation",
            "data": {
                "from": "/machine/ckqm8767i00nl0hd0sve14xos/tooling",
                "to": "/machine/ckqm8767i00nl0hd0sve14xos/tooling"
            }
        },
        {
            "timestamp": 1630337324.382,
            "category": "xhr",
            "data": {
                "method": "GET",
                "url": "https://api.demo.com/api/F9925/users/me",
                "status_code": 200
            },
            "type": "http"
        },
        {
            "timestamp": 1630337324.555,
            "category": "xhr",
            "data": {
                "method": "GET",
                "url": "https://api.demo.com/api/users/me/notifications?limit=10&skip=0",
                "status_code": 200
            },
            "type": "http"
        },
        {
            "timestamp": 1630337324.562,
            "category": "xhr",
            "data": {
                "method": "GET",
                "url": "https://api.demo.com/api/organizations/F9925",
                "status_code": 200
            },
            "type": "http"
        },
        {
            "timestamp": 1630337324.565,
            "category": "xhr",
            "data": {
                "method": "GET",
                "url": "https://api.demo.com/api/users/me/notifications/count",
                "status_code": 200
            },
            "type": "http"
        },
        {
            "timestamp": 1630337324.639,
            "category": "xhr",
            "data": {
                "method": "GET",
                "url": "https://api.demo.com/api/F9925/machines/ckqm8767i00nl0hd0sve14xos",
                "status_code": 200
            },
            "type": "http"
        },
        {
            "timestamp": 1630337324.721,
            "category": "xhr",
            "data": {
                "method": "GET",
                "url": "https://api.demo.com/api/v2/machines/ckqm8767i00nl0hd0sve14xos/tools?limit=1",
                "status_code": 200
            },
            "type": "http"
        },
        {
            "timestamp": 1630337324.727,
            "category": "xhr",
            "data": {
                "method": "GET",
                "url": "https://api.demo.com/api/F9925/machinegroups/ckmlosz5o1an30n9pqfq8eqh0/machines?skip=0&limit=1000",
                "status_code": 200
            },
            "type": "http"
        },
        {
            "timestamp": 1630337324.796,
            "category": "xhr",
            "data": {
                "method": "GET",
                "url": "https://api.demo.com/api/F9925/machines/ckqm8767i00nl0hd0sve14xos",
                "status_code": 200
            },
            "type": "http"
        },
        {
            "timestamp": 1630337324.817,
            "category": "xhr",
            "data": {
                "method": "GET",
                "url": "https://api.demo.com/api/v2/machines/ckqm8767i00nl0hd0sve14xos/tools?skip=1&limit=9",
                "status_code": 200
            },
            "type": "http"
        }
    ],
    "request": {
        "url": "https://uwa.demo.com/machine/ckqm8767i00nl0hd0sve14xos/tooling",
        "headers": {
            "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36"
        }
    }
}

Hope this help to understand the problem. If you need more detail let me know.

[AbhiPrasad]

Looking at similar issues: #3047, this maybe because of the Dedupe integration.

Are you receiving these errors in Sentry, or just in the debug console? If it's just in the debug console, this is expected behaviour, Dedupe is preventing duplicate errors from being sent.

[ForbesLindesay]

I'm seeing a similar issue in a React app. It is being reported to sentry, not just logged to the console. I don't have anything setting integrations so I think it should just have the default set of integrations:

Sentry.init({
  dsn: SENTRY_DSN,
  environment: hostname,
  allowUrls: [/.+\.example\.com/],
  ignoreErrors: [
    /NetworkError when attempting to fetch resource/,
    /The operation is not supported/,
    /The request is not allowed by the user agent or the platform in the current context/,
  ],
  beforeSend(event) {
    // exclude all events that have no stack trace
    if (event.stacktrace?.frames?.length) {
      return event
    } else {
      return null
    }
  },
})
Sentry.addGlobalEventProcessor(event => {
  const fullstorySessionUrl = window.FS?.getCurrentSessionURL?.(true)
  event.contexts = {
    ...(event.contexts || {}),
    fullstory: fullstorySessionUrl,
  }
  event.extra = {
    ...(event.extra || {}),
    fullstorySessionUrl,
  }
  return event
})

[AbhiPrasad]

Could you provide your Sentry.init config as well as a link to the event @ForbesLindesay?

[ForbesLindesay]

@AbhiPrasad was just updating my comment to add the init as you commented. Here's a link to the error in sentry:

https://sentry.io/organizations/mavenoid/issues/2509300625/

[kamilogorek]

Would you mind trying to update the SDK to the latest version? In 6.12.0 we added logging for drops due to Dedupe integration. I wonder if that might be the culprit.
Also if possible, setting up Source Maps would definitely be a tremendous help.

[darrylyoung]

I'm not sure if this is the exact issue you're having or if this error and warning are a result of something different but I've been seeing the following all morning and had no idea why as it was fine yesterday.

WARN  Sentry Logger [Warn]: Event dropped due to being a duplicate of previously captured event.
ERROR  Sentry Logger [Error]: SentryError: An event processor returned null, will not send event.

I hadn't changed anything since I was last working so I spent quite some time going through all the typical things to find the problem. Eventually I switched VPN (NordVPN) off, which I'd been using today, and the errors were gone. I tried on and off multiple times, rebuilding the app each time, and every time VPN was on, I had the issues. The rest of the time it was fine.

[github-actions]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

---

"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀