Time signature crash
OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 18.104.22.16870, revision: 29165bb
Steps to reproduce:
1. Download the provided sheet (Time_signature_plus_tie_crash.mscz)
2. Add 3/4 signature to first measure
3. Add 4/4 signature to second measure -> crashes
* Remove the generated tie after step 2.
Interestingly, it only crashes if the tie was generated by MuseScore. Removing the tie and re-adding it before doing step 3 prevents the crash somehow.