[19:19:51] [Server thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
	at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_172]
	at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_172]
	at net.minecraft.util.Util.runTask(Util.java:54) [Util.class:?]
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:796) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:741) [MinecraftServer.class:?]
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:192) [IntegratedServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:590) [MinecraftServer.class:?]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_172]
Caused by: java.lang.NullPointerException
	at net.minecraft.network.datasync.EntityDataManager.set(EntityDataManager.java:156) ~[EntityDataManager.class:?]
	at cam72cam.immersiverailroading.entity.EntityRollingStock.setLockOwner(EntityRollingStock.java:131) ~[EntityRollingStock.class:?]
	at cam72cam.immersiverailroading.entity.EntityRollingStock.processInitialInteract(EntityRollingStock.java:197) ~[EntityRollingStock.class:?]
	at cam72cam.immersiverailroading.entity.EntityBuildableRollingStock.processInitialInteract(EntityBuildableRollingStock.java:382) ~[EntityBuildableRollingStock.class:?]
	at cam72cam.immersiverailroading.entity.EntityRidableRollingStock.processInitialInteract(EntityRidableRollingStock.java:104) ~[EntityRidableRollingStock.class:?]
	at cam72cam.immersiverailroading.entity.EntityCoupleableRollingStock.processInitialInteract(EntityCoupleableRollingStock.java:178) ~[EntityCoupleableRollingStock.class:?]
	at cam72cam.immersiverailroading.entity.Freight.processInitialInteract(Freight.java:121) ~[Freight.class:?]
	at net.minecraft.entity.player.EntityPlayer.interactOn(EntityPlayer.java:1299) ~[EntityPlayer.class:?]
	at cam72cam.immersiverailroading.net.MousePressPacket$Handler.handle(MousePressPacket.java:75) ~[MousePressPacket$Handler.class:?]
	at cam72cam.immersiverailroading.net.MousePressPacket$Handler.lambda$0(MousePressPacket.java:52) ~[MousePressPacket$Handler.class:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_172]
	at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_172]
	at net.minecraft.util.Util.runTask(Util.java:53) ~[Util.class:?]
	... 5 more