Crash when adding key signature after transposing a section

I've been having a strange crash in the application. I want to copy a section of my song and then transpose it maybe a half or one step up. So I paste the section, then transpose, and since my copy doesn't take the key signature, I have to add the key signature after transposing. When I try to change the key signature, The application crashes and just closes without any message. It also happens sometimes when I place an incorrect key signature and then quickcly delete it and place another in the same spot.

How can I report this type of crashes? what logs or files should I attach?