Exception when computing island level

[minoneer]

Please paste the output from /usb version below

[18:43:16 INFO]: Name: uSkyBlock
[18:43:16 INFO]: Version: 3.1.0-SNAPSHOT
[18:43:16 INFO]: Description: Ultimate SkyBlock v3.1.0-SNAPSHOT-8bf78dc
[18:43:16 INFO]: Language: de (de)
[18:43:16 INFO]:   State: d=100, r=50, i=9,481, p=83,330, n=false, awe=false
[18:43:16 INFO]: Server: Paper 1.21.3-81-da71382 (MC: 1.21.3)
[18:43:16 INFO]:   State: online=true, bungee=true
[18:43:16 INFO]: ------------------------------
[18:43:16 INFO]: Vault 1.7.3-b131 (ENABLED)
[18:43:16 INFO]: WorldEdit 7.3.9+6959-7adf70b (ENABLED)
[18:43:16 INFO]: WorldGuard 7.0.13-beta-1+2f13ae0 (ENABLED)
[18:43:16 INFO]: Multiverse-Core 4.3.1-CUSTOM-b3 (ENABLED)
[18:43:16 INFO]: Multiverse-NetherPortals 4.2.1-b786 (ENABLED)
[18:43:16 INFO]: ------------------------------

What steps will reproduce the problem?

1. Build an island with a block that does not exist as an item (e.g., POTTED_DANDELION or LAVA)
2. Use the '/is level' command

If you have any log-files, please paste them to pastebin.com

[18:46:59 WARN]: [uSkyBlock] Plugin uSkyBlock v3.1.0-SNAPSHOT generated an exception while executing task 401040
java.lang.IllegalArgumentException: POTTED_DANDELION isn't an item
        at com.google.common.base.Preconditions.checkArgument(Preconditions.java:143) ~[guava-32.1.2-jre.jar:?]
        at org.bukkit.inventory.ItemStack.of(ItemStack.java:58) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:138) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:117) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:104) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?]
        at uSkyBlock.jar/us.talabrek.ultimateskyblock.island.level.BlockMatch.asItemStack(BlockMatch.java:21) ~[uSkyBlock.jar:?]
        at uSkyBlock.jar/us.talabrek.ultimateskyblock.island.level.BlockLevelConfig.calculateScore(BlockLevelConfig.java:63) ~[uSkyBlock.jar:?]
        at uSkyBlock.jar/us.talabrek.ultimateskyblock.island.level.BlockCountCollection.lambda$calculateScore$1(BlockCountCollection.java:38) ~[uSkyBlock.jar:?]
        at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[?:?]
        at java.base/java.util.concurrent.ConcurrentHashMap$EntrySpliterator.forEachRemaining(ConcurrentHashMap.java:3652) ~[?:?]
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[?:?]
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[?:?]
        at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921) ~[?:?]
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?]
        at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682) ~[?:?]
        at uSkyBlock.jar/us.talabrek.ultimateskyblock.island.level.BlockCountCollection.calculateScore(BlockCountCollection.java:40) ~[uSkyBlock.jar:?]
        at uSkyBlock.jar/us.talabrek.ultimateskyblock.island.level.CommonLevelLogic.createIslandScore(CommonLevelLogic.java:43) ~[uSkyBlock.jar:?]
        at uSkyBlock.jar/us.talabrek.ultimateskyblock.island.level.ChunkSnapshotLevelLogic.calculateScore(ChunkSnapshotLevelLogic.java:92) ~[uSkyBlock.jar:?]
        at uSkyBlock.jar/us.talabrek.ultimateskyblock.island.level.ChunkSnapshotLevelLogic.calculateScoreAndCallback(ChunkSnapshotLevelLogic.java:58) ~[uSkyBlock.jar:?]
        at uSkyBlock.jar/us.talabrek.ultimateskyblock.island.level.ChunkSnapshotLevelLogic$1$1$1.run(ChunkSnapshotLevelLogic.java:48) ~[uSkyBlock.jar:?]
        at org.bukkit.craftbukkit.scheduler.CraftTask.run(CraftTask.java:78) ~[paper-1.21.3.jar:1.21.3-81-da71382]
        at org.bukkit.craftbukkit.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:57) ~[paper-1.21.3.jar:1.21.3-81-da71382]
        at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22) ~[paper-1.21.3.jar:?]
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) ~[?:?]
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) ~[?:?]
        at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]