Plugin Event Crash
A plugin throws an exception while handling a game event, and it shows up in the console during play. The plugin has a bug or a misconfiguration that surfaces when a specific event fires.
What does this error mean?
Plugins register handlers for events (joins, blocks, interactions). An 'event handler exception' means a plugin's handler errored when an event occurred, the stack trace names the plugin and the event, pointing straight at the culprit.
Event handler exception
Most Common Causes
- A bug in the plugin's event handler.
- A misconfiguration the handler does not guard against.
- An incompatible server version for that plugin.
- A conflict with another plugin reacting to the same event.
- Missing data the handler assumed was present.
How To Diagnose
- Read the stack trace for the plugin and event named.
- Note what action triggers it (e.g. placing a block, joining).
- Check the plugin's config for the relevant feature.
- Test with the plugin alone to confirm.
Recommended Fixes
- Update the plugin
Install a build for your server version that fixes the bug. - Fix the config
Correct the setting the handler depends on. - Report or replace it
Report the bug, or swap to a maintained alternative if abandoned. - Resolve plugin conflicts
If two plugins fight over the event, reconfigure or remove one.
Frequently Asked Questions
Often it only errors for that event, but repeated or severe handler failures can destabilize things.
The event name in the trace plus the timing tell you which action sets it off.
Usually, though a conflicting plugin reacting to the same event can be involved.