Description: Exception in server tick loop

java.lang.ExceptionInInitializerError: null
	at com.pixelmonmod.pixelmon.battles.api.rules.clauses.BattleClauseRegistry.<clinit>(BattleClauseRegistry.java:46) ~[pixelmon:1.16.5-9.1.0] {re:classloading}
	at com.pixelmonmod.pixelmon.battles.attacks.Attack.checkSkyBattle(Attack.java:1653) ~[pixelmon:1.16.5-9.1.0] {re:classloading}
	at com.pixelmonmod.pixelmon.battles.controller.participants.PixelmonWrapper.checkSkyBattleDisable(PixelmonWrapper.java:1583) ~[pixelmon:1.16.5-9.1.0] {re:classloading}
	at com.pixelmonmod.pixelmon.battles.controller.participants.PixelmonWrapper.afterSwitch(PixelmonWrapper.java:1564) ~[pixelmon:1.16.5-9.1.0] {re:classloading}
	at com.pixelmonmod.pixelmon.battles.controller.BattleController.lambda$initBattle$0(BattleController.java:292) ~[pixelmon:1.16.5-9.1.0] {re:classloading}
	at com.pixelmonmod.pixelmon.battles.controller.BattleController.onUpdate(BattleController.java:991) ~[pixelmon:1.16.5-9.1.0] {re:classloading}
	at com.pixelmonmod.pixelmon.battles.controller.BattleController.update(BattleController.java:437) ~[pixelmon:1.16.5-9.1.0] {re:classloading}
	at com.pixelmonmod.pixelmon.battles.BattleRegistry.updateBattles(BattleRegistry.java:249) ~[pixelmon:1.16.5-9.1.0] {re:classloading}
	at com.pixelmonmod.pixelmon.battles.BattleTickHandler.tickStart(BattleTickHandler.java:13) ~[pixelmon:1.16.5-9.1.0] {re:classloading}
	at net.minecraftforge.eventbus.ASMEventHandler_114_BattleTickHandler_tickStart_WorldTickEvent.invoke(.dynamic) ~[?:?] {}
	at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:85) ~[eventbus-4.0.0.jar:?] {}
	at net.minecraftforge.eventbus.EventBus.post(EventBus.java:302) ~[eventbus-4.0.0.jar:?] {}
	at net.minecraftforge.eventbus.EventBus.post(EventBus.java:283) ~[eventbus-4.0.0.jar:?] {}
	at net.minecraftforge.fml.hooks.BasicEventHooks.onPostWorldTick(BasicEventHooks.java:86) ~[forge:?] {re:classloading}
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:857) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:291) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:787) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:642) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServer.java:232) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at java.lang.Thread.run(Thread.java:832) [?:?] {}
Caused by: java.util.NoSuchElementException: No value present
	at java.util.Optional.get(Optional.java:141) ~[?:?] {}
	at com.pixelmonmod.pixelmon.battles.api.rules.clauses.type.SkyBattleClause.<clinit>(SkyBattleClause.java:47) ~[pixelmon:1.16.5-9.1.0] {re:classloading}
	... 20 more