java.util.concurrent.CompletionException: java.lang.NullPointerException: Cannot invoke "it.unimi.dsi.fastutil.objects.ObjectArrayList.get(int)" because "this.wrapped" is null #6565

Unknownreported this bug

Aug 18, 2025 at 12:13 PM

The essence of the problem: when I use a projectile, I randomly get the following error in the console:

[20:54:33 WARN]: java.util.concurrent.CompletionException: java.lang.NullPointerException: Cannot invoke "it.unimi.dsi.fastutil.objects.ObjectArrayList.get(int)" because "this.wrapped" is null
[20:54:33 WARN]:        at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:315)
[20:54:33 WARN]:        at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:320)
[20:54:33 WARN]:        at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1159)
[20:54:33 WARN]:        at java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:483)
[20:54:33 WARN]:        at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387)
[20:54:33 WARN]:        at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1310)
[20:54:33 WARN]:        at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1841)
[20:54:33 WARN]:        at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1806)
[20:54:33 WARN]:        at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188)
[20:54:33 WARN]: Caused by: java.lang.NullPointerException: Cannot invoke "it.unimi.dsi.fastutil.objects.ObjectArrayList.get(int)" because "this.wrapped" is null
[20:54:33 WARN]:        at it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap$MapIterator.nextEntry(Object2ObjectOpenHashMap.java:638)
[20:54:33 WARN]:        at it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap$EntryIterator.next(Object2ObjectOpenHashMap.java:733)
[20:54:33 WARN]:        at it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap$EntryIterator.next(Object2ObjectOpenHashMap.java:728)
[20:54:33 WARN]:        at ModelEngine-4.0.8.jar//com.ticxo.modelengine.api.model.ModelUpdaters.lambda$tick$4(ModelUpdaters.java:60)
[20:54:33 WARN]:        at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1150)
[20:54:33 WARN]:        ... 6 more

This error occurs on the stable and latest version of ModelEngine.

You can check my video about it - https://youtu.be/OShkZeEeQQc

Unknowncommented

1 year ago

I noticed that if the projectile is a block, there’s no error, but if it’s a mob projectile, this error appears with some probability.

Unknowncommented

10 months ago

can you add the skill with which you get this error? will close for now, as we can not replicate this. you can reopen with more information on how to replicate this.

Core Plugins