I can't easily replicate it; but it has happened 3 times now.
I have two copies of the ide open, not sharing files.
I have several tabs open in each.
What seems trigger it is
on at least 4 files/tabs:
compile/run (F5) the file.
then close it when done.
Switch to a different tab (vs. the one it defaults to)
Repeat
Like I said, it is not easy to replicate, but those seem like they are the steps I have done each time I got a crash.
Error has been the same all 3 times
Close & switch tabs in editor
Error: Invalid memory access
File: c:\purebasi...\ScintillaHilightning.pb
Line: 3827
id build on 11/19/2018 [22:59] by Fred
Branch v5.70 Revision: 1832