When I press play on the launcher (1.3.7), it loads very fast and then a crash screen pops up.

Put the summary of the bug you're having here

*What I expected to happen was to load regularly and the game screen pop up so I could play some mc-war (COD Minecraft).

*What actually happened was it loaded faster and a crash screen popped up every time I loaded a launcher and pressed play.

Steps to Reproduce:
1. Open the latest launcher.
2. Press play.
3. When that happens, it loads fast then the crash screen appears.