Building Bricks

[19:33:05] [Server thread/ERROR]  [FML]: Exception caught during firing event com.hea3ven.buildingbricks.core.block.placement.ItemBlockUseEvent@40c381a4:
java.lang.NullPointerException
at com.hea3ven.buildingbricks.core.materials.MaterialStack.get(MaterialStack.java:20) ~[MaterialStack.class:?]
at com.hea3ven.buildingbricks.core.materials.MaterialRegistry.getMaterialForStack(MaterialRegistry.java:47) ~[MaterialRegistry.class:?]
at com.hea3ven.buildingbricks.core.block.placement.SlabCombinePlacementHandler.place(SlabCombinePlacementHandler.java:36) ~[SlabCombinePlacementHandler.class:?]
at com.hea3ven.buildingbricks.core.block.placement.BlockPlacementManager.onItemBlockUse(BlockPlacementManager.java:67) ~[BlockPlacementManager.class:?]
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_239_BlockPlacementManager_onItemBlockUse_ItemBlockUseEvent.invoke(.dynamic) ~[?:?]
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:49) ~[ASMEventHandler.class:?]
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:140) [EventBus.class:?]
at net.minecraft.item.ItemBlock.func_180614_a(ItemBlock.java:41) [acc.class:?]
at net.minecraftforge.common.ForgeHooks.onPlaceItemIntoWorld(ForgeHooks.java:735) [ForgeHooks.class:?]
at net.minecraft.item.ItemStack.func_179546_a(ItemStack.java:142) [adq.class:?]
at net.minecraft.server.management.PlayerInteractionManager.func_187251_a(PlayerInteractionManager.java:484) [lt.class:?]
at net.minecraft.network.NetHandlerPlayServer.func_184337_a(NetHandlerPlayServer.java:680) [mc.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:55) [jh.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:11) [jh.class:?]
at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) [fj$1.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_91]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_91]
at net.minecraft.util.Util.func_181617_a(SourceFile:45) [h.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:666) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:385) [lb.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:611) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:469) [MinecraftServer.class:?]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_91]

[19:33:05] [Server thread/ERROR]  [FML]: Index: 1 Listeners:
[19:33:05] [Server thread/ERROR]  [FML]: 0: NORMAL
[19:33:05] [Server thread/ERROR]  [FML]: 1: ASM: com.hea3ven.buildingbricks.core.block.placement.BlockPlacementManager@45a03fb3 onItemBlockUse(Lcom/hea3ven/buildingbricks/core/block/placement/ItemBlockUseEvent;)V
[19:33:05] [Server thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_91]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_91]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) [h.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:666) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:385) [lb.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:611) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:469) [MinecraftServer.class:?]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_91]

Caused by: java.lang.NullPointerException
at com.hea3ven.buildingbricks.core.materials.MaterialStack.get(MaterialStack.java:20) ~[MaterialStack.class:?]
at com.hea3ven.buildingbricks.core.materials.MaterialRegistry.getMaterialForStack(MaterialRegistry.java:47) ~[MaterialRegistry.class:?]
at com.hea3ven.buildingbricks.core.block.placement.SlabCombinePlacementHandler.place(SlabCombinePlacementHandler.java:36) ~[SlabCombinePlacementHandler.class:?]
at com.hea3ven.buildingbricks.core.block.placement.BlockPlacementManager.onItemBlockUse(BlockPlacementManager.java:67) ~[BlockPlacementManager.class:?]
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_239_BlockPlacementManager_onItemBlockUse_ItemBlockUseEvent.invoke(.dynamic) ~[?:?]
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:49) ~[ASMEventHandler.class:?]
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:140) ~[EventBus.class:?]
at net.minecraft.item.ItemBlock.func_180614_a(ItemBlock.java:41) ~[acc.class:?]
at net.minecraftforge.common.ForgeHooks.onPlaceItemIntoWorld(ForgeHooks.java:735) ~[ForgeHooks.class:?]
at net.minecraft.item.ItemStack.func_179546_a(ItemStack.java:142) ~[adq.class:?]
at net.minecraft.server.management.PlayerInteractionManager.func_187251_a(PlayerInteractionManager.java:484) ~[lt.class:?]
at net.minecraft.network.NetHandlerPlayServer.func_184337_a(NetHandlerPlayServer.java:680) ~[mc.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:55) ~[jh.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:11) ~[jh.class:?]
at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) ~[fj$1.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_91]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_91]
at net.minecraft.util.Util.func_181617_a(SourceFile:45) ~[h.class:?]
... 5 more
[19:33:08] [Server thread/INFO]: TheRealp455w0rd lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}