NanoVG Crash

I’m working in a GUI system for my game but NanoVG is crashing the 80% of the time and don’t working correctly the 99% of the time.
The crashes goes from JVM Fatal Errors to JVM stops working, the crashes are fully randomly. One problem is that the font isn’t rendering. I am using the exact same code from the demo if is the case that my code has a bug but still has the same problem.
This are the JVM Fatal Error log (short log): http://pastebin.java-gaming.org/102c154933915

EDIT:
Some images of the errors:
Working good:

http://puu.sh/m7LQY/a4cf423366.png

Buged:

http://puu.sh/m7LOF/7aa9fb3c4f.png