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Mythic Crucible throwing NPE when a MM ItemStack is loaded

I have the following MythicMobs Item configured:

Wasserbeutel:
  ItemStack:
    ==: org.bukkit.inventory.ItemStack
    v: 2730
    type: POTION
    meta:
      ==: ItemMeta
      meta-type: POTION
      display-name: '{"extra":[{"italic":false,"color":"gold","text":"Wasserbeutel"}],"text":""}'
      lore:
      - '{"extra":[{"bold":false,"italic":false,"underlined":false,"strikethrough":false,"obfuscated":false,"color":"dark_green","text":"Gewöhnlich"}],"text":""}'
      - '{"text":""}'
      - '{"extra":[{"italic":false,"color":"dark_gray","text":"Ein Beutel, gefüllt
        mit Wasser."}],"text":""}'
      potion-type: minecraft:mundane

This item is causing the following error in the console:

[20:09:26 WARN]: [MythicMobs] Failed to load Artifact skills for item Wasserbeutel
[20:09:26 WARN]: java.lang.NullPointerException: Cannot invoke "org.bukkit.Material.toString()" because the return value of "io.lumine.mythic.core.items.MythicItem.getMaterial()" is null
[20:09:26 WARN]:        at MythicCrucible-1.5.0-SNAPSHOT.jar//io.lumine.mythiccrucible.items.ItemManager.loadItems(ItemManager.java:127)
[20:09:26 WARN]:        at MythicCrucible-1.5.0-SNAPSHOT.jar//io.lumine.mythiccrucible.items.ItemManager.lambda$load$1(ItemManager.java:100)
[20:09:26 WARN]:        at MythicMobs-5.2.0-SNAPSHOT(Premium).jar//io.lumine.mythic.bukkit.utils.Delegates$RunnableToSupplier.get(Delegates.java:121)
[20:09:26 WARN]:        at MythicMobs-5.2.0-SNAPSHOT(Premium).jar//io.lumine.mythic.bukkit.utils.promise.LuminePromise$SupplyRunnable.run(LuminePromise.java:654)
[20:09:26 WARN]:        at MythicMobs-5.2.0-SNAPSHOT(Premium).jar//io.lumine.mythic.bukkit.utils.tasks.LumineExecutors$SchedulerWrappedRunnable.run(LumineExecutors.java:70)
[20:09:26 WARN]:        at org.bukkit.craftbukkit.v1_17_R1.scheduler.CraftTask.run(CraftTask.java:101)
[20:09:26 WARN]:        at org.bukkit.craftbukkit.v1_17_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:483)
[20:09:26 WARN]:        at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1567)
[20:09:26 WARN]:        at net.minecraft.server.dedicated.DedicatedServer.b(DedicatedServer.java:490)
[20:09:26 WARN]:        at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:1483)
[20:09:26 WARN]:        at net.minecraft.server.MinecraftServer.x(MinecraftServer.java:1282)
[20:09:26 WARN]:        at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:319)
[20:09:26 WARN]:        at java.base/java.lang.Thread.run(Thread.java:833)

I am using the following Plugin version on the latest version of PaperMC 1.17.1: MythicMobs:

[20:35:12 INFO]: Server Version: org.bukkit.craftbukkit.v1_17_R1 (Paper)
[20:35:12 INFO]: Plugin Version: 5.2.0
[20:35:12 INFO]: Plugin Build: 4eeb7e0a
[20:35:12 INFO]: Is Premium: Yes
[20:35:12 INFO]: Is Dev Build: Yes
[20:35:12 INFO]: Supported Version: Yes

MythicCrucuible: 1.5.0-SNAPSHOT

Edited by Marvin Klar