[08:52:57] [Server thread/ERROR]: Could not pass event PlayerToggleSneakEvent to ProjectKorra v1.8.6
org.bukkit.event.EventException: null
at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:72) ~[patched_1.12.2.jar:git-Paper-1322]
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[patched_1.12.2.jar:git-Paper-1322]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[patched_1.12.2.jar:git-Paper-1322]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:515) ~[patched_1.12.2.jar:git-Paper-1322]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:500) ~[patched_1.12.2.jar:git-Paper-1322]
at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1530) ~[patched_1.12.2.jar:git-Paper-1322]
at net.minecraft.server.v1_12_R1.PacketPlayInEntityAction.a(SourceFile:43) ~[patched_1.12.2.jar:git-Paper-1322]
at net.minecraft.server.v1_12_R1.PacketPlayInEntityAction.a(SourceFile:9) ~[patched_1.12.2.jar:git-Paper-1322]
at net.minecraft.server.v1_12_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:14) ~[patched_1.12.2.jar:git-Paper-1322]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_111]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_111]
at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [patched_1.12.2.jar:git-Paper-1322]
at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:843) [patched_1.12.2.jar:git-Paper-1322]
at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:426) [patched_1.12.2.jar:git-Paper-1322]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:767) [patched_1.12.2.jar:git-Paper-1322]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:665) [patched_1.12.2.jar:git-Paper-1322]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_111]
Caused by: java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901) ~[?:1.8.0_111]
at java.util.ArrayList$Itr.next(ArrayList.java:851) ~[?:1.8.0_111]
at com.strangeone101.abilities.ElementTrap.<init>(ElementTrap.java:84) ~[?:?]
at com.strangeone101.abilities.ElementTrapListener.onSneak(ElementTrapListener.java:24) ~[?:?]
at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor778.execute(Unknown Source) ~[?:?]
at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:70) ~[patched_1.12.2.jar:git-Paper-1322]
... 16 more