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Thrown Entity Crash

The server crashes while ticking a thrown projectile, an arrow, snowball, potion, or similar. The projectile has invalid data or a mod bug, removing it clears the crash.

What does this error mean?
Projectiles are entities updated each tick. 'Error ticking projectile' means a thrown entity hit invalid data (often bad coordinates or owner data) or a mod bug while ticking, which can crash-loop if it sits in a loaded chunk. 
Error ticking projectile
Most Common Causes
  • Corrupted projectile NBT after a crash.
  • Invalid (NaN) coordinates or velocity.
  • A mod bug in custom projectile logic.
  • Broken owner/reference data on the projectile.
  • Damage from an unclean shutdown.
How To Diagnose
  1. Get the projectile type and coordinates from the crash report.
  2. Map the location to its region/chunk.
  3. Check for a projectile/combat mod in the stack trace.
  4. Back up the region before editing.
Recommended Fixes
  • Remove the projectile
    Delete the entity at those coordinates in MCA Selector.
  • Restore from backup
    Roll back the chunk if needed.
  • Update/remove the mod
    Address any mod implicated in the projectile crash.
  • Regenerate the chunk
    Delete the chunk as a last resort to clear the bad entity.
Analyze My Log
Frequently Asked Questions

No, only a single transient projectile, nothing of value.

If its data is corrupt or a mod mishandles it, ticking it throws an error every tick.

The crash report gives the projectile's coordinates and dimension.