Reported by prickly_kirch99 on Curseforge:

Any fix for this? Happened when breaking a jukebox that was playing. No cats near.

Description: Unexpected error
java.util.ConcurrentModificationException
at java.base/java.util.HashMap$HashIterator.nextNode(HashMap.java:1597)
at java.base/java.util.HashMap$EntryIterator.next(HashMap.java:1630)
at java.base/java.util.HashMap$EntryIterator.next(HashMap.java:1628)
at com.shmove.cat_jam.cat_jam.tickPlayingDiscs(cat_jam.java:35)
at net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientTickEvents.lambda$static$6(ClientTickEvents.java:63)
at net.minecraft.class_638.handler$cdi000$fabric-lifecycle-events-v1$tickWorldAfterBlockEntities(class_638.java:3134)
at net.minecraft.class_638.method_18116(class_638.java:265)
at net.minecraft.class_310.method_1574(class_310.java:2011)
at net.minecraft.class_310.method_1523(class_310.java:1289)
at net.minecraft.class_310.method_1514(class_310.java:888)
at net.minecraft.client.main.Main.main(Main.java:265)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:470)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)