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Checking right now. This is a very rare issue and the error message indicate WP core files. So in this case we also need to investigate whole site (not just theme/plugins ) to correct the issue as it may not be connected to our code (also no other user is reporting this).
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No this is external code which is interfereing here.
first : http://prntscr.com/lorfkp
Second the Visual tab has been disbaled
http://prntscr.com/lorgb1
This visual tab is tinyMCE , so I need to re-enable it.
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Yes, I will try to resolve it at my best.
Can you check if this issue appears with other users as well because this issue can be user specific.