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Villager Data Crash

The server crashes loading a villager. The mob has corrupted data, often a malformed trade or brain/AI memory, removing or repairing that villager clears the crash.

What does this error mean?
Villagers store complex data: trades, profession, and AI 'brain' memories. 'Error loading villager' means that data is invalid, so the server fails while reading or ticking the villager, sometimes crash-looping if it sits in a loaded chunk. 
Error loading villager
Most Common Causes
  • Corrupted villager NBT after a crash.
  • A malformed trade offer (often from a plugin/mod).
  • Invalid AI/brain memory data.
  • A mod bug affecting villager logic.
  • Damage from an unclean shutdown mid-save.
How To Diagnose
  1. Read the crash report for the villager's coordinates and dimension.
  2. Map the location to its region/chunk.
  3. Check for a trade/villager mod or plugin in the stack trace.
  4. Back up the region before editing.
Recommended Fixes
  • Remove the villager
    Delete the villager at those coordinates in MCA Selector to clear the bad data.
  • Restore from backup
    Roll the chunk back if the villager/trades matter.
  • Fix the trade source
    Update or remove a plugin/mod that produced the invalid trade.
  • Regenerate the chunk
    As a last resort, delete the chunk so it regenerates without the broken mob.
Analyze My Log
Frequently Asked Questions

Removing one villager does not destroy the village, only that single mob is lost.

A malformed trade offer, often plugin-made, can produce data the server cannot parse.

The crash report lists the villager's exact block coordinates and dimension.