Qt Creator 14 beta 2 crashes upon closing while there is a separate window for code editor

This is not something that can be consistently reproduced. Original reporter only saw it a few times randomly, and I myself haven't reproduced it even once yet.

So it is said that popping out a separate code editor by "Spilt" -> "Open in new window", moving new window to another screen, and then close the Qt Creator may lead to crash. Trace attached.