---- Minecraft Crash Report ----
// My bad.

Time: 3/30/20 12:04 AM
Description: Exception in server tick loop

java.lang.IllegalArgumentException: Material cannot be null
    at org.apache.commons.lang.Validate.notNull(Validate.java:192)
    at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:82)
    at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:70)
    at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:58)
    at me.mvabo.verydangerouscaves.randomizers.chestRandomizer.getItems(chestRandomizer.java:107)
    at me.mvabo.verydangerouscaves.randomizers.chestRandomizer.fillChest(chestRandomizer.java:21)
    at me.mvabo.verydangerouscaves.generators.caveGenerator.randomTrap(caveGenerator.java:416)
    at me.mvabo.verydangerouscaves.generators.caveGenerator.populate(caveGenerator.java:103)
    at net.minecraft.server.v1_15_R1.Chunk.loadCallback(Chunk.java:531)
    at net.minecraft.server.v1_15_R1.PlayerChunk.lambda$12(PlayerChunk.java:390)
    at net.minecraft.server.v1_15_R1.PlayerChunkMap$CallbackExecutor.run(PlayerChunkMap.java:96)
    at net.minecraft.server.v1_15_R1.ChunkProviderServer$a.executeNext(ChunkProviderServer.java:580)
    at net.minecraft.server.v1_15_R1.ChunkProviderServer.runTasks(ChunkProviderServer.java:246)
    at net.minecraft.server.v1_15_R1.MinecraftServer.ba(MinecraftServer.java:885)
    at net.minecraft.server.v1_15_R1.MinecraftServer.executeNext(MinecraftServer.java:869)
    at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.awaitTasks(SourceFile:127)
    at net.minecraft.server.v1_15_R1.MinecraftServer.sleepForTick(MinecraftServer.java:853)
    at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:793)
    at java.lang.Thread.run(Thread.java:748)