Html Webpack Plugin error when theme is set up

[rastislavcore]

• I confirm that this is an issue rather than a question.

Bug report

Deploying and enabling the theme ououe give us result with error: TypeError: Cannot read property '0' of undefined. Started with yarn dev.

Steps to reproduce

Theme repo ououe.

1. Install Vuepress latest version (^1.6.0)
2. Install ououe theme
3. Setup in config theme to ououe
4. start dev server

What is expected?

I am expecting the blog, but insted I am getting the error.

What is actually happening?

Following error on the screen:

Html Webpack Plugin:

  TypeError: Cannot read property '0' of undefined
  
  - index.js:14 exports.normalizeHeadTag
    [blog]/[@vuepress]/core/lib/node/util/index.js:14:22
  
  - HeadPlugin.js:23 tags.forEach.tag
    [blog]/[@vuepress]/core/lib/node/webpack/HeadPlugin.js:23:28
  
  - Array.forEach
  
  - HeadPlugin.js:22 compilation.hooks.htmlWebpackPluginAlterAssetTags.tapAsync
    [blog]/[@vuepress]/core/lib/node/webpack/HeadPlugin.js:22:21
  
  
  - new Promise
  
  
  - Hook.js:154 AsyncSeriesWaterfallHook.lazyCompileHook
    [blog]/[tapable]/lib/Hook.js:154:20
  
  - index.js:673 
    [blog]/[vuepress-html-webpack-plugin]/index.js:673:47
  
  - index.js:187 Promise.resolve.then.then.then.then.then.then.then.result
    [blog]/[vuepress-html-webpack-plugin]/index.js:187:18
  
  - task_queues.js:86 processTicksAndRejections
    internal/process/task_queues.js:86:5

Other relevant information

• Output of npx vuepress info in my VuePress project:

Environment Info:

  System:
    OS: macOS 10.15.6
  Binaries:
    Node: 11.13.0 - ~/.nvm/versions/node/v11.13.0/bin/node
    Yarn: 1.22.4 - ~/.yarn/bin/yarn
    npm: 6.14.6 - ~/.nvm/versions/node/v11.13.0/bin/npm
  Browsers:
    Firefox: 81.0
  npmPackages:
    @vuepress/core:  1.6.0 
    @vuepress/theme-default:  1.6.0 
    vuepress: ^1.6.0 => 1.6.0 
  npmGlobalPackages:
    vuepress: Not Found

[d-pollard]

Closing since this seems to have been resolved, see here for steps: https://github.com/tolking/vuepress-theme-ououe/issues/27#issuecomment-700753178

[rastislavcore]

Actually this issue is still valid, resolved just for the particular theme. I believe Vuejs have still difficulties.