Crash when copying voltas

If we try to copy & paste a staff with voltas (endings), MuseScore crashes on copy.

To reproduce :
1. Create a new partition with 2 instruments
2. Enter a few notes on the first intrument
3. Add volta 1 and voltat 2 at the end of the score
4. Select all the mesure of the first instrument to copy on the second instrument. It should crash.

Repeated on MuseScore 2.0 (rev 1774a74, on Linux Mint 14 - 64 bits, and on Linux Mint 15 - 32 bits)

Probably related to this problem : If we save this score before copying, then when we reopen the file, the second volta is missing. See attached file (we miss second ending and we can't copy the first staff onto the second one).