Mod Version: DynamicSurroundings-1.12.2-3.4.8.2.jar

Forge Version: Forge 14.23.1.2555

Link to crash log (if applicable):
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909)
at java.util.ArrayList$Itr.next(ArrayList.java:859)
at org.blockartistry.DynSurround.client.hud.PotionHUD.doRender(PotionHUD.java:213)
at org.blockartistry.DynSurround.client.hud.GuiHUDHandler.onRenderGameOverlayEvent(GuiHUDHandler.java:84)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_292_GuiHUDHandler_onRenderGameOverlayEvent_Pre.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:179)
at net.minecraftforge.client.GuiIngameForge.pre(GuiIngameForge.java:900)
at net.minecraftforge.client.GuiIngameForge.renderPotionIcons(GuiIngameForge.java:225)
at net.minecraftforge.client.GuiIngameForge.func_175180_a(GuiIngameForge.java:174)

Description:
Game crashed. As my son just played, I don't know what happened. But as he told me this occurred several times.

Is the modpack available online?

EDIT: Also, try the latest BETA. I made some changes in the PotionHUD for other issues since the build you are currently using and it may have a bearing on the problem.

EDIT2: Can you also post the complete log? This one has me real curious as to what is going on. That list it is complaining about is one that DS maintains and there should be no way a concurrency exception could be thrown. Only way that could happen is that something is ticking on a non-client thread, or something is doing rendering on a non-client thread.

Hi,
it's just a list of mods I collected on my own.
I will use a newer version, should have been my first approach.
You will get a complete log if this will occur again, as I did not keep it.

Could you tell me by this trace what I could test in special to reproduce this issue?

No specific test really. What it would require is knowing which mod is causing the problem, and then getting it to generate a sound at the same time Minecraft is updating it's internal sound list. Not something you can do blackbox.

@StefanHirche Hey! Have you had a chance to check out an updated version?

Closing due to inactivity. If the issue still occurs feel free to reopen and supply the client log. Thanks!