Console Error

[21:41:47] [Server thread/INFO]: Location stored in the MySQL database.
[21:41:51] [Server thread/ERROR]: Could not pass event InventoryClickEvent to InfiniteStorage v1.0-SNAPSHOT
org.bukkit.event.EventException: null
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:309) ~[my.jar:git-Spigot-f56e2e7-4385562]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[my.jar:git-Spigot-f56e2e7-4385562]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:500) ~[my.jar:git-Spigot-f56e2e7-4385562]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:485) ~[my.jar:git-Spigot-f56e2e7-4385562]
    at net.minecraft.server.v1_13_R2.PlayerConnection.a(PlayerConnection.java:2122) ~[my.jar:git-Spigot-f56e2e7-4385562]
    at net.minecraft.server.v1_13_R2.PacketPlayInWindowClick.a(SourceFile:33) ~[my.jar:git-Spigot-f56e2e7-4385562]
    at net.minecraft.server.v1_13_R2.PacketPlayInWindowClick.a(SourceFile:10) ~[my.jar:git-Spigot-f56e2e7-4385562]
    at net.minecraft.server.v1_13_R2.PlayerConnectionUtils.a(SourceFile:10) ~[my.jar:git-Spigot-f56e2e7-4385562]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_151]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_151]
    at net.minecraft.server.v1_13_R2.SystemUtils.a(SourceFile:199) [my.jar:git-Spigot-f56e2e7-4385562]
    at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:896) [my.jar:git-Spigot-f56e2e7-4385562]
    at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:417) [my.jar:git-Spigot-f56e2e7-4385562]
    at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:831) [my.jar:git-Spigot-f56e2e7-4385562]
    at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:729) [my.jar:git-Spigot-f56e2e7-4385562]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_151]
Caused by: java.lang.NullPointerException
    at rip.captain.infinitestorage.handler.ItemHandler.onClick(ItemHandler.java:203) ~[InfiniteStorage-1.0-SNAPSHOT.jar:?]
    at sun.reflect.GeneratedMethodAccessor725.invoke(Unknown Source) ~[?:?]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_151]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_151]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:305) ~[my.jar:git-Spigot-f56e2e7-4385562]
    ... 15 more
[21:41:51] [Server thread/INFO]: Successfully updated an item amount from the MySQL database.
[21:41:52] [Server thread/INFO]: [V] [Nomad] Feline_Fancy: Pumpkin + torch do not equal it
[21:41:57] [Server thread/INFO]: Successfully updated an item amount from the MySQL database.