@bender-tags: 4.7.1, 424, bug
@bender-ui: collapsed
@bender-ckeditor-plugins: floatingspace, toolbar, list, tab

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1. Open console.
1. Click into 1st `Hello world`.
1. Press `TAB` few times to cycle through other editors.
1. There should be no error in the console.

**Unexpected:** Error with status: `Uncaught TypeError: Cannot read property 'contains' of null`
