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java.lang.NullPointerException: 	at org.bukkit.inventory.ItemStack.(ItemStack.java:94)	at org.bukkit.inventory.ItemStack.deserialize(ItemStack.java:536)	at io.github.yannici.bedwars.Villager.MerchantCategory.loadCategories(MerchantCategory.java:117)	at io.github.yannici.bedwars.Game.Game.loadItemShopCategories(Game.java:1046)	at io.github.yannici.bedwars.Game.Game.start(Game.java:232)	at io.github.yannici.bedwars.Listener.PlayerListener.onPlayerInteract(PlayerListener.java:937)	at sun.reflect.GeneratedMethodAccessor219.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306)	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)	at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:228)	at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:195)	at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:191)	at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:717)	at net.minecraft.server.v1_8_R3.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:52)	at net.minecraft.server.v1_8_R3.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:1)	at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44)	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715)	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374)	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654)	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557)	at java.lang.Thread.run(Thread.java:745)