i, i've a server magma with fusion pixelmon v1.11, it's work good but sometime give this error:

04.01 22:06:38 [Server] Server thread/ERROR [Minecraft]: Could not pass event PlayerInteractEvent to FusionPixelmon v1.11
04.01 22:06:38 [Server] INFO org.bukkit.event.EventException: null
04.01 22:06:38 [Server] INFO at org.bukkit.plugin.EventExecutor.lambda$create$1(EventExecutor.java:68) ~[EventExecutor.class:46f4149]
04.01 22:06:38 [Server] INFO at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[RegisteredListener.class:46f4149]
04.01 22:06:38 [Server] INFO at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:507) [SimplePluginManager.class:46f4149]
04.01 22:06:38 [Server] INFO at org.bukkit.craftbukkit.v1_12_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:263) [CraftEventFactory.class:46f4149]
04.01 22:06:38 [Server] INFO at org.bukkit.craftbukkit.v1_12_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:230) [CraftEventFactory.class:46f4149]
04.01 22:06:38 [Server] INFO at org.bukkit.craftbukkit.v1_12_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:226) [CraftEventFactory.class:46f4149]
04.01 22:06:38 [Server] INFO at net.minecraft.network.NetHandlerPlayServer.func_175087_a(NetHandlerPlayServer.java:1652) [pa.class:?]
04.01 22:06:38 [Server] INFO at net.minecraft.network.play.client.CPacketAnimation.func_148833_a(SourceFile:32) [ly.class:?]
04.01 22:06:38 [Server] INFO at net.minecraft.network.play.client.CPacketAnimation.func_148833_a(SourceFile:9) [ly.class:?]
04.01 22:06:38 [Server] INFO at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) [hv$1.class:?]
04.01 22:06:38 [Server] INFO at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_211]
04.01 22:06:38 [Server] INFO at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_211]
04.01 22:06:38 [Server] INFO at net.minecraft.util.Util.func_181617_a(SourceFile:46) [h.class:?]
04.01 22:06:38 [Server] INFO at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:924) [MinecraftServer.class:?]
04.01 22:06:38 [Server] INFO at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:456) [nz.class:?]
04.01 22:06:38 [Server] INFO at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:861) [MinecraftServer.class:?]
04.01 22:06:38 [Server] INFO at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:733) [MinecraftServer.class:?]
04.01 22:06:38 [Server] INFO at java.lang.Thread.run(Thread.java:748) [?:1.8.0_211]
04.01 22:06:38 [Server] INFO Caused by: java.lang.NullPointerException

What FusionPixelmon type (Forge, Sponge, etc)? When does the error message show?

it is the spigot version (I have a magma server as already mentioned); the error occurs in the console randomly, with no visible effects in the game, perhaps with extra lagg, and without specific fusion actions being made (for example, commands are used etc.)

I have found that it is the wielding of enchanted objects that triggers the error!!!

Can you show the full error message? Because you only showed the top part

Nevermind, reproduced it and fixed it. It will be included in the next version. Thanks

Perfect tnks