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Broken Beacon

The server errors on a beacon block entity with invalid data. One beacon has corrupted NBT, removing or replacing it clears the issue.

What does this error mean?
A beacon stores its active effects and state as a block entity. 'Invalid beacon data' means that stored data is malformed, so the server errors when loading or ticking the beacon. 
Invalid beacon data
Most Common Causes
  • Corrupted beacon NBT after a crash.
  • An invalid stored effect value.
  • A mod/plugin writing bad beacon data.
  • A partially written chunk.
  • Damage from an unclean shutdown.
How To Diagnose
  1. Read the crash/error for the beacon coordinates and dimension.
  2. Map it to the region/chunk.
  3. Check for a beacon-related mod/plugin in the trace.
  4. Back up the region first.
Recommended Fixes
  • Replace the beacon
    Remove the beacon at those coordinates in MCA Selector and place a new one.
  • Restore from backup
    Roll back the chunk if needed.
  • Fix the data source
    Update or remove a plugin/mod writing bad beacon data.
  • Regenerate the chunk
    Delete the chunk to force a clean rebuild as a last resort.
Analyze My Log
Frequently Asked Questions

Beacons do not store items, you only replace the block itself.

Only that one has corrupt data, the rest are fine.

The error lists the beacon's exact coordinates and dimension.