Crash when the code folding [...] is backspaced in IDE v8.174

[Moebius]

Not a major problem, but if you're like me and try backspacing the line of  "   [...]   "  that indicates code folding, the editor becomes confused.  The code seems to become both folded and unfolded at the same time in an eerie superposition!  After that, trying to fold/unfold the code, undoing, or trying to edit the code folding indicator line again - i.e. doing anything that tells the editor to change the folding status of the code - will cause it to crash.
In the attached screenshot you can see that the green bar has a + on it and the [...], indicating folding, but the code is unfolded.

This is by no means a major problem, but if by chance you have some tie on your hands to waste on something as unimportant is this, please go ahead 

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[Kitty Hello]

OK, can be reproduced.