crashed minecraft with tnt. wasnt a huge amount

Minecraft has crashed!
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Minecraft has stopped running because it encountered a problem; Ticking entity

A full error report has been saved to C:\Users\Robert\AppData\Roaming\.minecraft\crash-reports\crash-2012-12-09_15.34.32-server.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash