warningJava ErrorsAffects: All versions
How to Fix ConcurrentModificationException
Fix ConcurrentModificationException by updating the buggy mod or plugin. This is a threading issue in the mod's code.
Quick Fix
Update the mod or plugin shown in the stack trace. This is a threading bug in the mod's code.
Error Message
java.util.ConcurrentModificationExceptionHow to Fix
1
Update the offending mod or plugin
2
Report the bug to the mod developer
3
If a plugin, check if it is using async tasks incorrectly
4
Reduce server load to make the race condition less likely
Common Causes
- A mod modifying a list while another thread is iterating it
- Plugin accessing Bukkit API from async thread
- Race condition in server tick processing
Diagnostic Steps
- Identify the mod from the stack trace
- Check if an update is available
- If no update, report to the developer
- Consider an alternative mod
FAQ
Can I fix this myself?
This is a code bug in the mod. Only the developer can properly fix it. Updating or switching mods is your best option.