Warning: Trying to access array offset on value of type null

[remi-vasco]

API Platform version(s) affected: 3.1.14

Description
I got an error after upgrading from 3.1.4 to 3.1.14: Warning: Trying to access array offset on value of type null

{
  "@context": "/contexts/Error",
  "@type": "hydra:Error",
  "hydra:title": "An error occurred",
  "hydra:description": "Warning: Trying to access array offset on value of type null",
  "trace": [
    {
      "namespace": "",
      "short_class": "",
      "class": "",
      "type": "",
      "function": "",
      "file": "/srv/backend/vendor/api-platform/core/src/Api/IdentifiersExtractor.php",
      "line": 87,
      "args": []
    },
    {
      "namespace": "ApiPlatform\\Api",
      "short_class": "IdentifiersExtractor",
      "class": "ApiPlatform\\Api\\IdentifiersExtractor",
      "type": "->",
      "function": "getIdentifiersFromOperation",
      "file": "/srv/backend/vendor/api-platform/core/src/Api/IdentifiersExtractor.php",
      "line": 57,
      "args": [
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            "iri_only": [
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            ],
            "request_uri": [
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              "/securities/20"
            ],
            "uri": [
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            ],
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            "collect_denormalization_errors": [
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      "function": "getIdentifiersFromItem",
      "file": "/srv/backend/vendor/api-platform/core/src/Symfony/Routing/IriConverter.php",
      "line": 177,
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            "request_uri": [
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            "uri": [
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      "function": "dispatch",
      "file": "/srv/backend/vendor/symfony/event-dispatcher/Debug/TraceableEventDispatcher.php",
      "line": 139,
      "args": [
        [
          "object",
          "Symfony\\Component\\HttpKernel\\Event\\ViewEvent"
        ],
        [
          "string",
          "kernel.view"
        ]
      ]
    },
    {
      "namespace": "Symfony\\Component\\EventDispatcher\\Debug",
      "short_class": "TraceableEventDispatcher",
      "class": "Symfony\\Component\\EventDispatcher\\Debug\\TraceableEventDispatcher",
      "type": "->",
      "function": "dispatch",
      "file": "/srv/backend/vendor/symfony/http-kernel/HttpKernel.php",
      "line": 171,
      "args": [
        [
          "object",
          "Symfony\\Component\\HttpKernel\\Event\\ViewEvent"
        ],
        [
          "string",
          "kernel.view"
        ]
      ]
    },
    {
      "namespace": "Symfony\\Component\\HttpKernel",
      "short_class": "HttpKernel",
      "class": "Symfony\\Component\\HttpKernel\\HttpKernel",
      "type": "->",
      "function": "handleRaw",
      "file": "/srv/backend/vendor/symfony/http-kernel/HttpKernel.php",
      "line": 74,
      "args": [
        [
          "object",
          "Symfony\\Component\\HttpFoundation\\Request"
        ],
        [
          "integer",
          1
        ]
      ]
    },
    {
      "namespace": "Symfony\\Component\\HttpKernel",
      "short_class": "HttpKernel",
      "class": "Symfony\\Component\\HttpKernel\\HttpKernel",
      "type": "->",
      "function": "handle",
      "file": "/srv/backend/vendor/symfony/http-kernel/Kernel.php",
      "line": 197,
      "args": [
        [
          "object",
          "Symfony\\Component\\HttpFoundation\\Request"
        ],
        [
          "integer",
          1
        ],
        [
          "boolean",
          true
        ]
      ]
    },
    {
      "namespace": "Symfony\\Component\\HttpKernel",
      "short_class": "Kernel",
      "class": "Symfony\\Component\\HttpKernel\\Kernel",
      "type": "->",
      "function": "handle",
      "file": "/srv/backend/vendor/symfony/runtime/Runner/Symfony/HttpKernelRunner.php",
      "line": 35,
      "args": [
        [
          "object",
          "Symfony\\Component\\HttpFoundation\\Request"
        ]
      ]
    },
    {
      "namespace": "Symfony\\Component\\Runtime\\Runner\\Symfony",
      "short_class": "HttpKernelRunner",
      "class": "Symfony\\Component\\Runtime\\Runner\\Symfony\\HttpKernelRunner",
      "type": "->",
      "function": "run",
      "file": "/srv/backend/vendor/autoload_runtime.php",
      "line": 29,
      "args": []
    },
    {
      "namespace": "",
      "short_class": "",
      "class": "",
      "type": "",
      "function": "require_once",
      "file": "/srv/backend/public/index.php",
      "line": 5,
      "args": [
        [
          "string",
          "/srv/backend/vendor/autoload_runtime.php"
        ]
      ]
    }
  ]
}

How to reproduce
Create an entity with a child entity in doctrine (inheritance). Place a

#[ApiResource(
    operations: [
        new Get(
            normalizationContext: ['groups' => ['security:get']],
            security: 'is_granted(\'ROLE_ADMIN\')',
        ),
    ],
)]

on the parent and access the parent uri /parent/{id}

Possible Solution
Was working in 3.1.4

Additional Context

[remi-vasco]

Sorry for the long Stacktrace, but maybe there is something that can help.

Thansk by advance for your advices

[mrossard]

Could you provide a simple reproducer for this?

[remi-vasco]

Hello,

Ok I will try to isolate the bug today

[soyuka]

looks related to

An related object is coverted to an array  Failed to denormalize attribute "calendar" value for class "App\Entity\Event": Expected argument of type "?App\Entity\Calendar", "array" given at property path "calendar". I'll look further into it tomorrow

related to:
#5747

@remi-vasco just provide your minimal resources + the HTTP request that makes this fail please