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java.lang.NullPointerException: 	at com.minecolonies.entity.ai.citizen.lumberjack.Tree.addAndSearch(Tree.java:340)	at com.minecolonies.entity.ai.citizen.lumberjack.Tree.(Tree.java:125)	at com.minecolonies.entity.ai.citizen.lumberjack.EntityAIWorkLumberjack.setNewTree(EntityAIWorkLumberjack.java:274)	at com.minecolonies.entity.ai.citizen.lumberjack.EntityAIWorkLumberjack.findTree(EntityAIWorkLumberjack.java:260)	at com.minecolonies.entity.ai.citizen.lumberjack.EntityAIWorkLumberjack.findTrees(EntityAIWorkLumberjack.java:241)	at com.minecolonies.entity.ai.util.AITarget.apply(AITarget.java:125)	at com.minecolonies.entity.ai.basic.AbstractAISkeleton.applyTarget(AbstractAISkeleton.java:192)	at com.minecolonies.entity.ai.basic.AbstractAISkeleton.checkOnTarget(AbstractAISkeleton.java:175)	at java.util.stream.MatchOps$1MatchSink.accept(MatchOps.java:90)	at java.util.ArrayList$ArrayListSpliterator.tryAdvance(ArrayList.java:1351)	at java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:126)	at java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:498)	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:485)	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)	at java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:230)	at java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:196)	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)	at java.util.stream.ReferencePipeline.anyMatch(ReferencePipeline.java:449)	at com.minecolonies.entity.ai.basic.AbstractAISkeleton.func_75246_d(AbstractAISkeleton.java:129)	at net.minecraft.entity.ai.EntityAITasks.func_75774_a(SourceFile:129)	at net.minecraft.entity.EntityLiving.func_70626_be(EntityLiving.java:773)	at net.minecraft.entity.EntityLivingBase.func_70636_d(EntityLivingBase.java:2189)	at net.minecraft.entity.EntityLiving.func_70636_d(EntityLiving.java:577)	at net.minecraft.entity.EntityAgeable.func_70636_d(EntityAgeable.java:155)	at com.minecolonies.entity.EntityCitizen.func_70636_d(EntityCitizen.java:636)	at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:2019)	at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:295)	at org.spongepowered.common.event.tracking.TrackingUtil.tickEntity(TrackingUtil.java:143)	at net.minecraft.world.WorldServer.redirect$onCallEntityUpdate$0(WorldServer.java:1297)	at net.minecraft.world.World.func_72866_a(World.java:1964)	at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:838)	at net.minecraft.world.World.func_72870_g(World.java:1934)	at net.minecraft.world.World.func_72939_s(World.java:1217)	at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:704)	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:709)	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387)	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)	at java.lang.Thread.run(Thread.java:745)