pressing Ctrl+d in edit page causes to crash in some situations

So, when I selected text like this and pressed Ctrl+D (to select several strings at once), Qt Creator crashed. I repeated the same thing after restarting, and it crashed as well.

(by "crashed" I mean entered infinite load. i waited for 5 minutes, but nothing seemed to be changing and I closed the app.)

if this is somehow relevant to problem - I have windows 10 corporate 1809, x64, Processor Intel core i7-8750H