I can't go no fullscreen

Put the summary of the bug you're having here

*What I expected to happen was... fullscreen
Describe what you thought should happen here
i thought that it should of gone to full screen mode

What actually happened was...: i pressed F11 and it crashed
Describe what happened here i pressed F11 to make the game fullscreen

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...