Uncaught TypeError: Cannot read property 'compare' of null

[Rob]

Users frequenly encounter "Uncaught TypeError: Cannot read property 'compare' of null". They haven't given me good repro steps, but they can produce it quite frequently. Current example is Chrome 35 on Windows.

version: 4.4.2 (also seen it as far back as 4.2)

erroring line: ​https://github.com/ckeditor/ckeditor-dev/blob/master/core/selection.js#L43

build configuration: ​http://ckeditor.com/builder/224773061e31c4aa24a72388cd90ca5b

[Jakub Ś]

I'm sorry but this is to little information.

1. The most important thing is providing steps to reproduce this problem. Without steps we won't be able to do anything.

Once you know how to reproduce this issue:

1. Please send us your build-config.js
2. If you have any Chrome Browser plugins, try disabling them and check this issue again.
3. If you have any third-party plugins not available in standard package, please disable them, clear browser cache (this isn't not Ctrl+F5) and recheck this issue.

[Piotrek Koszuliński]

Looking at #12155, #12154 and this issue I start to believe that this must be some Chrome plugin. We have not seen any of them and they were not reported by anyone else.

I remember that there was one pretty popular Chrome plugin which was a total disaster. It was causing some mysterious selection and DOM issues. Kuba, do you remember what was that?