Saving is corrupting my files

Windows 10, MuseScore 2.0.2.
MuseScore was working fine until I decided to take the bottom staff of the piano off the score and tried to save it, a message just popped up, saying; "MuseScore.exe has requested to terminate in an unusual way. Runtime Error."
After about three tries, my score corrupted and I couldn't open it.

I tried opening/saving a few more scores, and they worked fine...
Here's the score I was working on: Long_Lost.mscz
Please help!