[01:06:47 ERROR]: Could not pass event InventoryClickEvent to GuardShop v1.0.0
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1630) [spigot-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:31) [spigot-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:9) [spigot-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Spigot-db6de12-18fbb24]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_251]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_251]
        at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [spigot-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [spigot-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Spigot-db6de12-18fbb24]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_251]
Caused by: java.lang.NullPointerException: Unable to find a nms item clone for ItemStack{AIR x 0}
        at systems.kscott.guardshop.inventoryframework.shade.mininbt.ItemNBTUtil.getTag(ItemNBTUtil.java:88) ~[?:?]
        at systems.kscott.guardshop.inventoryframework.pane.Pane.lambda$findMatchingItem$3(Pane.java:524) ~[?:?]
        at java.util.stream.ReferencePipeline$2$1.accept(Unknown Source) ~[?:1.8.0_251]
        at java.util.HashMap$ValueSpliterator.tryAdvance(Unknown Source) ~[?:1.8.0_251]
        at java.util.stream.ReferencePipeline.forEachWithCancel(Unknown Source) ~[?:1.8.0_251]
        at java.util.stream.AbstractPipeline.copyIntoWithCancel(Unknown Source) ~[?:1.8.0_251]
        at java.util.stream.AbstractPipeline.copyInto(Unknown Source) ~[?:1.8.0_251]
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) ~[?:1.8.0_251]
        at java.util.stream.FindOps$FindOp.evaluateSequential(Unknown Source) ~[?:1.8.0_251]
        at java.util.stream.AbstractPipeline.evaluate(Unknown Source) ~[?:1.8.0_251]
        at java.util.stream.ReferencePipeline.findAny(Unknown Source) ~[?:1.8.0_251]
        at systems.kscott.guardshop.inventoryframework.pane.Pane.findMatchingItem(Pane.java:537) ~[?:?]
        at systems.kscott.guardshop.inventoryframework.pane.StaticPane.click(StaticPane.java:176) ~[?:?]
        at systems.kscott.guardshop.inventoryframework.GuiListener.onInventoryClick(GuiListener.java:77) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_251]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_251]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_251]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_251]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot-1.8.8-R0.1-SNAPSHOT-latest.jar:git-Spigot-db6de12-18fbb24]
        ... 15 more