Crash

---- Minecraft Crash Report ----

WARNING: coremods are present:
  NowWithRendering (hopperducts-mc1.8.8-1.4.6.jar)
  ThaumcraftLoader (Thaumcraft-1.8.9-5.2.1.jar)
  dsurroundcore (DynamicSurroundings-1.8.9-2.0.5.4BETA.jar)
  FldLoadingPlugin (FastLeafDecay-1.8-1.6.jar)
  FMLPlugin (InventoryTweaks-1.60-beta-38.jar)
  EnderCorePlugin (EnderCore-1.8.9-0.3.0.1-beta.jar)
  TrashSlot (trashslot-mc1.8.9-2.0.7.jar)
  CoreMod (Aroma1997Core-1.8.9-1.0.4.1.jar)
  DCLoadingPlugin (DummyCore-2.2.189.0.jar)
Contact their authors BEFORE contacting forge

// Oops.

Time: 3/10/16 5:24 PM
Description: Exception in server tick loop

java.lang.NullPointerException: Exception in server tick loop
	at net.minecraft.tileentity.TileEntity.func_145838_q(TileEntity.java:175)
	at chanceCubes.rewards.rewardparts.OffsetTileEntity.spawnFallingBlock(OffsetTileEntity.java:32)
	at chanceCubes.rewards.rewardparts.OffsetTileEntity$2.callback(OffsetTileEntity.java:66)
	at chanceCubes.util.Scheduler.tickTasks(Scheduler.java:24)
	at chanceCubes.listeners.TickListener.onTick(TickListener.java:17)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_200_TickListener_onTick_ServerTickEvent.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.minecraftforge.fml.common.FMLCommonHandler.onPreServerTick(FMLCommonHandler.java:266)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:594)
	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:152)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:481)
	at java.lang.Thread.run(Unknown Source)