Can playing a sound async / after sleep cause crash?

[Coder]

I have a code that uses ExecutorService to execute code async from the client so the game doesn't freeze.

In rare occasions the game will actually crash after playing a sound, can this be possible?

 

java.util.ConcurrentModificationException: null
    at com.google.common.collect.HashBiMap$Itr.hasNext(HashBiMap.java:401) ~[guava-21.0.jar:?]
    at net.minecraft.client.audio.SoundManager.func_148605_d(SoundManager.java:252) ~[chm.class:?]
 

Edited June 5, 2018 by Coder

[Coder]

2 hours ago, diesieben07 said:

You cannot interact with the game in any way (except through the methods in IThreadListener and maybe a very few others) from threads other than the main thread.

Why is it happening only at random occasions then?