fix crash when entering invalid invite token

closes #9216

Still crashes

added 17 commits

• db9774be...447cfa0c - 16 commits from branch master
• 15f5e75c - fix crash when entering invalid invite token

Compare with previous version

I retried and wasn't able to reproduce the crash with this change. Maybe I haven't caught everything, but the fix covers at least 1 type of crash.

enabled an automatic merge when all merge checks for 15f5e75c pass

merged