PlayerKits Error

[13:02:49] [Server thread/ERROR] [Minecraft/]: Could not pass event InventoryClickEvent to PlayerKits2 v1.12.4
org.bukkit.event.EventException: null
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[arclight:arclight-1.16.5-1.0.25-SNAPSHOT-aeef36e9] {re:mixin,re:classloading}
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:589) ~[arclight:arclight-1.16.5-1.0.25-SNAPSHOT-aeef36e9] {re:classloading}
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:576) ~[arclight:arclight-1.16.5-1.0.25-SNAPSHOT-aeef36e9] {re:classloading}
        at net.minecraft.network.play.ServerPlayNetHandler.func_147351_a(ServerPlayNetHandlerMixin.java:2957) ~[?:?] {re:mixin,re:classloading,pl:mixin:APP:mixins.arclight.core.json:network.play.ServerPlayNetHandlerMixin,pl:mixin:A}
        at net.minecraft.network.play.client.CClickWindowPacket.func_148833_a(CClickWindowPacket.java:34) ~[?:?] {re:classloading,pl:runtimedistcleaner:A,re:mixin,pl:runtimedistcleaner:A}
        at net.minecraft.network.play.client.CClickWindowPacket.func_148833_a(CClickWindowPacket.java:12) ~[?:?] {re:classloading,pl:runtimedistcleaner:A,re:mixin,pl:runtimedistcleaner:A}
        at net.minecraft.network.PacketThreadUtil.mdf97b60$lambda$checkThreadAndEnqueue$0$0(PacketThreadUtilMixin.java:536) ~[?:?] {re:mixin,re:classloading,pl:mixin:A}
        at net.minecraft.util.concurrent.TickDelayedTask.run(SourceFile:18) ~[?:?] {re:classloading}
        at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213166_h(SourceFile:144) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,re:mixin,pl:accesstransformer:B}
        at net.minecraft.util.concurrent.RecursiveEventLoop.func_213166_h(SourceFile:23) ~[?:?] {re:mixin,re:computing_frames,re:classloading,re:mixin}
        at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServerMixin.java:734) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:mixins.arclight.core.json:server.MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A,re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A}
        at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServerMixin.java:159) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:mixins.arclight.core.json:server.MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A,re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A}
        at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213168_p(SourceFile:118) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,re:mixin,pl:accesstransformer:B}
        at net.minecraft.server.MinecraftServer.func_213205_aW(MinecraftServerMixin.java:717) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:mixins.arclight.core.json:server.MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A,re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A}
        at net.minecraft.server.MinecraftServer.func_213168_p(MinecraftServerMixin.java:711) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:mixins.arclight.core.json:server.MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A,re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A}
        at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213161_c(SourceFile:127) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,re:mixin,pl:accesstransformer:B}
        at net.minecraft.server.MinecraftServer.func_213202_o(MinecraftServerMixin.java:697) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:mixins.arclight.core.json:server.MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A,re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A}
        at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServerMixin.java:1921) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:mixins.arclight.core.json:server.MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A,re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A}
        at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServerMixin.java:232) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:mixins.arclight.core.json:server.MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A,re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A}
        at java.lang.Thread.run(Thread.java:834) [?:?] {}
Caused by: java.lang.IllegalArgumentException: Material cannot be null
        at org.apache.commons.lang.Validate.notNull(Validate.java:192) ~[commons-lang-2.6.jar:2.6] {}
        at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:82) ~[arclight:arclight-1.16.5-1.0.25-SNAPSHOT-aeef36e9] {re:mixin,re:classloading}
        at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:70) ~[arclight:arclight-1.16.5-1.0.25-SNAPSHOT-aeef36e9] {re:mixin,re:classloading}
        at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:58) ~[arclight:arclight-1.16.5-1.0.25-SNAPSHOT-aeef36e9] {re:mixin,re:classloading}
        at pk.ajneb97.utils.ItemUtils.createItemFromID(ItemUtils.java:56) ~[?:?] {re:classloading,re:classloading,re:classloading,re:classloading}
        at pk.ajneb97.managers.KitItemManager.createItemFromKitItem(KitItemManager.java:131) ~[?:?] {re:classloading,re:classloading,re:classloading,re:classloading}
        at pk.ajneb97.managers.edit.InventoryEditDisplayManager.openInventory(InventoryEditDisplayManager.java:99) ~[?:?] {re:classloading,re:classloading,re:classloading,re:classloading}
        at pk.ajneb97.managers.edit.InventoryEditManager.clickInventory(InventoryEditManager.java:378) ~[?:?] {re:classloading,re:classloading,re:classloading,re:classloading}
        at pk.ajneb97.listeners.InventoryEditListener.clickInventory(InventoryEditListener.java:66) ~[?:?] {re:classloading,re:classloading,re:classloading,re:classloading}
        ... 20 more