Minecraft stop responding after switching from creative world to my survival world. The game said it ran out of memory and told me to try loading the world again so i did then it completely crashed and sent me to the launcher crash report.I have never had this type of problem before. My PC has handled more from minecraft but in 1.7.4 at moments with nothing running in the background it will seem like it drops FPS for a sec or two then run fine. Also the only thing up and running was photo viewer, a movie pulling from a SSD and Google chrome. Normally i have more up and running then that and it never has done anything to minecraft.

What I expected to happen was...:
I expected my survival world to load up after switching from my Creative world.

What actually happened was...:
The game ran out of memory and then crashed twice and the second time it sent me back to the launcher.

Steps to Reproduce:
It just happen during world change. i just think it was a random crash

java.lang.NullPointerException: Unexpected error
	at bmt.a(SourceFile:238)
	at bmt.a(SourceFile:220)
	at azi.a(SourceFile:1674)
	at azi.a(SourceFile:1632)
	at bjw.a(SourceFile:118)