Null reference error while calling unslectable method

[pankaj5080]

Type of report

Bug

Provide detailed reproduction steps (if any)

When CKEDITOR.replace method is called some times it is giving null exception for calling unselectable method.

Please find below error:
ckeditor.js?v=xxxxxx:372 Uncaught TypeError: Cannot read properties of null (reading 'unselectable')
    at b (ckeditor.js?v=xxxxxx:372:391)
    at a. (ckeditor.js?v=xxxxxx:368:471)
    at a.r (ckeditor.js?v=xxxxxx:10:246)
    at a. (ckeditor.js?v=xxxxxx:12:91)
    at a.CKEDITOR.editor.CKEDITOR.editor.fire (ckeditor.js?v=xxxxxx:13:286)
    at a.fireOnce (ckeditor.js?v=xxxxxx:12:251)
    at a.CKEDITOR.editor.CKEDITOR.editor.fireOnce (ckeditor.js?v=xxxxxx:13:442)
    at Object. (ckeditor.js?v=xxxxxx:283:139)
    at w (ckeditor.js?v=xxxxxx:261:193)
    at Object.load (ckeditor.js?v=xxxxxx:261:216)

In some system this is frequent issue 1 time out of 4 attempts while other systems it is reproducing rarely like 1 time out of 50 attempts.

Expected result

There should a null check in method b before calling unselectable method

Actual result

If the element does not found then calling unselectable on null throws exception in console.

Other details

• Browser: chrome
• OS: windows
• CKEditor version: 4.20

[Comandeer]

It looks similar to #4390. Such an issue could be resolved by using the delayed editor creation. Could you check if it fixes your issue?

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