Libreoffice Crashes on input of special character

Hey there,
I have a problem.
Whenever I try to insert a special character in LO Writer the whole program with all windows crashes.

I already tried to debug with gdb:

Thread 1 “soffice.bin” received signal SIGSEGV, Segmentation fault.

0x00007f0fbd88fe3c in rtl_uString_assign () from /usr/lib/libreoffice/program/

I use LO from debian backports on debian busterx64

I see this is a somehow common problem but seemed to be fixed with LO 5.10, but I’m experiencing this issue even with LO >6

Hello, possibly bug #tdf124429

Thanks, I wrote a comment there and will update this question accordingly.

Okay, this one was pretty unspectacular.
I solved this issue just by clearing the cache.

this solved the issue, but I don’t have enough karma to mark my own answer as solution, so if someone could mark this as correct, that would be nice.