java.util.ConcurrentModificationException: This exception has no message.

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This exception has no message.
java.util.ConcurrentModificationException:
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437)
at com.minecolonies.colony.Colony.cleanUpBuildings(Colony.java:765)
at com.minecolonies.colony.Colony.onWorldTick(Colony.java:721)
at com.minecolonies.colony.ColonyManager.lambda$onWorldTick$59(ColonyManager.java:500)
at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
at java.util.HashMap$ValueSpliterator.forEachRemaining(HashMap.java:1620)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
at com.minecolonies.colony.ColonyManager.onWorldTick(ColonyManager.java:500)
at com.minecolonies.event.FMLEventHandler.onWorldTick(FMLEventHandler.java:47)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_55_FMLEventHandler_onWorldTick_WorldTickEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:49)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:140)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:686)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:344)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:605)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:481)
at java.lang.Thread.run(Thread.java:745)

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