spawner

[12:37:41 ERROR]: Could not pass event PlayerInteractEvent to ApeironSpawner v1.0
org.bukkit.event.EventException: null
        at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:72) ~[patched_1.13.2.jar:git-Paper-402]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[patched_1.13.2.jar:git-Paper-402]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[patched_1.13.2.jar:git-Paper-402]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:513) ~[patched_1.13.2.jar:git-Paper-402]
        at org.bukkit.craftbukkit.v1_13_R2.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:267) ~[patched_1.13.2.jar:git-Paper-402]
        at org.bukkit.craftbukkit.v1_13_R2.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:234) ~[patched_1.13.2.jar:git-Paper-402]
        at org.bukkit.craftbukkit.v1_13_R2.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:230) ~[patched_1.13.2.jar:git-Paper-402]
        at net.minecraft.server.v1_13_R2.PlayerConnection.a(PlayerConnection.java:1794) ~[patched_1.13.2.jar:git-Paper-402]
        at net.minecraft.server.v1_13_R2.PacketPlayInArmAnimation.a(PacketPlayInArmAnimation.java:24) ~[patched_1.13.2.jar:git-Paper-402]
        at net.minecraft.server.v1_13_R2.PacketPlayInArmAnimation.a(PacketPlayInArmAnimation.java:5) ~[patched_1.13.2.jar:git-Paper-402]
        at net.minecraft.server.v1_13_R2.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:12) ~[patched_1.13.2.jar:git-Paper-402]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_181]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_181]
        at net.minecraft.server.v1_13_R2.SystemUtils.a(SystemUtils.java:109) ~[patched_1.13.2.jar:git-Paper-402]
        at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:1016) ~[patched_1.13.2.jar:git-Paper-402]
        at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:439) ~[patched_1.13.2.jar:git-Paper-402]
        at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:943) ~[patched_1.13.2.jar:git-Paper-402]
        at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:841) ~[patched_1.13.2.jar:git-Paper-402]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_181]
Caused by: java.lang.ArrayIndexOutOfBoundsException: 9
        at java.util.Arrays$ArrayList.set(Arrays.java:3846) ~[?:1.8.0_181]
        at net.minecraft.server.v1_13_R2.NonNullList.set(SourceFile:53) ~[patched_1.13.2.jar:git-Paper-402]
        at org.bukkit.craftbukkit.v1_13_R2.inventory.CraftInventoryCustom$MinecraftInventory.setItem(CraftInventoryCustom.java:108) ~[patched_1.13.2.jar:git-Paper-402]
        at org.bukkit.craftbukkit.v1_13_R2.inventory.CraftInventory.setItem(CraftInventory.java:98) ~[patched_1.13.2.jar:git-Paper-402]
        at gyurix.apeironspawner.SpawnerGUI.showPage(SpawnerGUI.java:68) ~[?:?]
        at gyurix.apeironspawner.SpawnerGUI.<init>(SpawnerGUI.java:54) ~[?:?]
        at gyurix.apeironspawner.ApeironSpawner.onInteract(ApeironSpawner.java:98) ~[?:?]
        at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor743.execute(Unknown Source) ~[?:?]
        at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:70) ~[patched_1.13.2.jar:git-Paper-402]
        ... 18 more