I was crafting a bigger map and it happened this.. please report back
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[media][media][media]

Note:
Description: Updating screen events
java.lang.NullPointerException
at ut.d(SourceFile:235)
at ur.a(SourceFile:294)
at sq.b(SourceFile:41)
at sq.a(SourceFile:58)

Update your Java, check http://www.java.com
But this ticket is invalid as it relates to a modded or 3rd party client/server.
Any non-standard client/server build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the plugin creator.
This site is for addressing issues related to the base unmodded MineCraft.