Self Built MuseScore 3.0.0 crashes when trying to load or save a score

Hello,

I was trying to compile MuseScore myself on ubuntu 14.04. I followed the instructions for ubuntu and linux in general and could compile the code.
Whenever I try to load or save a score the program crashes and the terminal prints: "Gtk-WARNING **: Invalid input string Segmentation fault (core dumped)"

Is this a problem with v3.0.0?

Thanks and kind regards