I recently upgraded our server to the latest version then I joined to try out the new, fantastic fireworks. I pulled the lever to trigger the fireworks the game threw me out and no longer lets me in. I checked the server log and I found the following message:

2012-12-20 13:26:26 [INFO] segabor[/192.168.253.136:55221] logged in with entity id 52694 at (4950.7381270665355, 75.0, -4820.762329032032)
java.lang.NullPointerException
at ef.a(SourceFile:310)
at mj.a(SourceFile:237)
at mj.a(SourceFile:157)
at et.a(SourceFile:36)
at ef.a(SourceFile:214)
at cg.h(SourceFile:178)
at cg.d(SourceFile:15)
at ci.run(SourceFile:114)
2012-12-20 13:26:27 [INFO] segabor lost connection: disconnect.genericReason

Please help me! Or I will cry till the End of the World!