Crashing after saving 3.6 Win 10 x64

Hello,

I just updated my Musescore to the latest 3.6 version and continued working on a file. I saved the file as usual. If I try to open it now, the programm crashes immidiately.
I was asking a friend to open it on Mac and it worked. Than he copied the notes to a new file and sent it back. Then I was able to open it and continued working. After saving the trouble started again.

Heres the current file. I need it desperately for my study and would be glad to get an quick solution.

Thanks