I was just playing, and it may not have been able to process how quickly I was updating my screen. A split second after I closed a chest inventory, I pressed a number on my keyboard to update the item I was holding, and I think it may have just been because I was too fast for the game to handle, but I decided to report it anyways.
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Yeah, it happened to be that I had forge modloader installed =/
Yes! I was able to reproduce it in vanilla, I uploaded a new crash report.

Your Java is outdated, give it an update.
Sorry, I'm unable to, and Minecraft won't work on my java 7 computer.
Duplicate of MC-3619.
I could not find any existing issue that contains any of the crashes mentioned here. However, all of the crash reports that you have provided are from a modded version of Minecraft. Please try to reproduce the crash in a vanilla (non-modded) version of Minecraft and attach that report or this may be dismissed as being caused by a mod.