Null Issue

[sandboxgamer92]

Hi,
I got a Null Issue:

Server thread/ERROR]: Could not pass event PlayerItemHeldEvent to Modifyworld v${project.version} org.bukkit.event.EventException: null at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:320) ~[spigot.jar:git-Spigot-2ee05fe-d31f05f] at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[spigot.jar:git-Spigot-2ee05fe-d31f05f] at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:529) ~[spigot.jar:git-Spigot-2ee05fe-d31f05f] at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:514) ~[spigot.jar:git-Spigot-2ee05fe-d31f05f] at net.minecraft.server.v1_15_R1.PlayerConnection.a(PlayerConnection.java:1428) ~[spigot.jar:git-Spigot-2ee05fe-d31f05f] at net.minecraft.server.v1_15_R1.PacketPlayInHeldItemSlot.a(SourceFile:30) ~[spigot.jar:git-Spigot-2ee05fe-d31f05f] at net.minecraft.server.v1_15_R1.PacketPlayInHeldItemSlot.a(SourceFile:8) ~[spigot.jar:git-Spigot-2ee05fe-d31f05f] at net.minecraft.server.v1_15_R1.PlayerConnectionUtils.lambda$0(PlayerConnectionUtils.java:19) ~[spigot.jar:git-Spigot-2ee05fe-d31f05f] at net.minecraft.server.v1_15_R1.TickTask.run(SourceFile:18) [spigot.jar:git-Spigot-2ee05fe-d31f05f] at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeTask(SourceFile:144) [spigot.jar:git-Spigot-2ee05fe-d31f05f] at net.minecraft.server.v1_15_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) [spigot.jar:git-Spigot-2ee05fe-d31f05f] at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeNext(SourceFile:118) [spigot.jar:git-Spigot-2ee05fe-d31f05f] at net.minecraft.server.v1_15_R1.MinecraftServer.aZ(MinecraftServer.java:917) [spigot.jar:git-Spigot-2ee05fe-d31f05f] at net.minecraft.server.v1_15_R1.MinecraftServer.executeNext(MinecraftServer.java:910) [spigot.jar:git-Spigot-2ee05fe-d31f05f] at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.awaitTasks(SourceFile:127) [spigot.jar:git-Spigot-2ee05fe-d31f05f] at net.minecraft.server.v1_15_R1.MinecraftServer.sleepForTick(MinecraftServer.java:894) [spigot.jar:git-Spigot-2ee05fe-d31f05f] at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:827) [spigot.jar:git-Spigot-2ee05fe-d31f05f] at java.lang.Thread.run(Unknown Source) [?:1.8.0_231]