Crash #2 from log

[08:40:33] [Server thread/ERROR]: Encountered an unexpected exception
net.minecraft.util.ReportedException: Exception ticking world
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:948) ~[MinecraftServer.class:?]
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:431) ~[lt.class:?]
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:809) ~[MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:669) [MinecraftServer.class:?]
	at java.lang.Thread.run(Unknown Source) [?:1.7.0_71]
Caused by: java.lang.IllegalStateException: TickNextTick list out of synch
	at net.minecraft.world.WorldServer.func_72955_a(WorldServer.java:684) ~[mt.class:?]
	at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:279) ~[mt.class:?]
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:931) ~[MinecraftServer.class:?]
	... 4 more
[08:40:33] [Server thread/ERROR]: 	Cause of unexpected exception was
java.lang.IllegalStateException: TickNextTick list out of synch
	at net.minecraft.world.WorldServer.func_72955_a(WorldServer.java:684) ~[mt.class:?]
	at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:279) ~[mt.class:?]
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:931) ~[MinecraftServer.class:?]
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:431) ~[lt.class:?]
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:809) ~[MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:669) [MinecraftServer.class:?]
	at java.lang.Thread.run(Unknown Source) [?:1.7.0_71]
[08:40:33] [Server thread/ERROR]: This crash report has been saved to: /home/minecraft/multicraft/servers/server12/./crash-reports/crash-2016-01-08_08.40.33-server.txt
[08:40:33] [Server thread/INFO]: Stopping server