Completely no information on what might cause that bug or how to counter it.
There is no information in logs except that:
[SERVER] Exception catched
[2016-02-06 124:32] java.lang.NullPointerException
[2016-02-06 124:32] at org.schema.game.common.controller.io.SegmentDataIO.a(SourceFile:677)
[2016-02-06 124:32] at obfuscated.anc.a(SourceFile:253)
[2016-02-06 124:32] at obfuscated.anc.a(SourceFile:180)
[2016-02-06 124:32] at obfuscated.anc.a(SourceFile:217)
[2016-02-06 124:32] at org.schema.game.common.controller.SegmentBuffer.a(SourceFile:485)
[2016-02-06 124:32] at org.schema.game.common.controller.SegmentBuffer.a(SourceFile:423)
[2016-02-06 124:32] at org.schema.game.common.controller.SegmentBuffer.a(SourceFile:563)
[2016-02-06 124:32] at org.schema.game.common.controller.SegmentBuffer.a(SourceFile:55
[2016-02-06 124:32] at org.schema.game.common.controller.SegmentBufferManager.a(SourceFile:315)
[2016-02-06 124:32] at org.schema.game.common.controller.EditableSendableSegmentController.isEmptyOnServer(SourceFile:436)