[02:13:02] [Server thread/ERROR]: Could not pass event InventoryClickEvent to GuardiansOfAdelia v0.1
org.bukkit.event.EventException: null
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:309) ~[spigot-1.13.2.jar:git-Spigot-3cb9dcb-77ca7ca]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-1.13.2.jar:git-Spigot-3cb9dcb-77ca7ca]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501) ~[spigot-1.13.2.jar:git-Spigot-3cb9dcb-77ca7ca]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486) ~[spigot-1.13.2.jar:git-Spigot-3cb9dcb-77ca7ca]
	at net.minecraft.server.v1_13_R2.PlayerConnection.a(PlayerConnection.java:2123) ~[spigot-1.13.2.jar:git-Spigot-3cb9dcb-77ca7ca]
	at net.minecraft.server.v1_13_R2.PacketPlayInWindowClick.a(SourceFile:33) ~[spigot-1.13.2.jar:git-Spigot-3cb9dcb-77ca7ca]
	at net.minecraft.server.v1_13_R2.PacketPlayInWindowClick.a(SourceFile:10) ~[spigot-1.13.2.jar:git-Spigot-3cb9dcb-77ca7ca]
	at net.minecraft.server.v1_13_R2.PlayerConnectionUtils.lambda$0(PlayerConnectionUtils.java:9) ~[spigot-1.13.2.jar:git-Spigot-3cb9dcb-77ca7ca]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:?]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:?]
	at net.minecraft.server.v1_13_R2.SystemUtils.a(SourceFile:199) [spigot-1.13.2.jar:git-Spigot-3cb9dcb-77ca7ca]
	at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:896) [spigot-1.13.2.jar:git-Spigot-3cb9dcb-77ca7ca]
	at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:417) [spigot-1.13.2.jar:git-Spigot-3cb9dcb-77ca7ca]
	at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:831) [spigot-1.13.2.jar:git-Spigot-3cb9dcb-77ca7ca]
	at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:729) [spigot-1.13.2.jar:git-Spigot-3cb9dcb-77ca7ca]
	at java.lang.Thread.run(Unknown Source) [?:?]
Caused by: java.lang.IllegalArgumentException: ItemStacks representing air cannot store NMS information.
	at com.comphenix.protocol.wrappers.nbt.NbtFactory.checkItemStack(NbtFactory.java:287) ~[?:?]
	at com.comphenix.protocol.wrappers.nbt.NbtFactory.fromItemTag(NbtFactory.java:160) ~[?:?]
	at io.github.lix3nn53.guardiansofadelia.utilities.NBTTagUtils.putInteger(NBTTagUtils.java:62) ~[?:?]
	at io.github.lix3nn53.guardiansofadelia.npc.merchant.MerchantManager.setShopPrice(MerchantManager.java:55) ~[?:?]
	at io.github.lix3nn53.guardiansofadelia.npc.merchant.MerchantGuiLine.addWord(MerchantGuiLine.java:19) ~[?:?]
	at io.github.lix3nn53.guardiansofadelia.npc.merchant.MerchantShop.getWeaponShop(MerchantShop.java:187) ~[?:?]
	at io.github.lix3nn53.guardiansofadelia.npc.merchant.MerchantShop.getGui(MerchantShop.java:53) ~[?:?]
	at io.github.lix3nn53.guardiansofadelia.events.MyInventoryClickEvent.onEvent(MyInventoryClickEvent.java:71) ~[?:?]
	at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
	at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:?]
	at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:?]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:?]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:305) ~[spigot-1.13.2.jar:git-Spigot-3cb9dcb-77ca7ca]
	... 15 more