[1.0] Insert vertical frame between two parts of the same line (volta, cresc) causes crash

MuseScore 1.0

1. Create a score on two lines with a line break
2. Insert a volta on the last measure of the first system
3. Extend the volta on the second system
4. Insert a vertical frame between the two systems --> Crash

Note : inserting the frame first and then the extend the volta crashes as well.

See attached file.