Ticking entity crash Minecraft server mod

What this actually means

A mod's own tick code threw. This is a bug in that mod, not in your setup -- the entity hit a state its author did not handle (commonly a null passenger, vehicle, target or owner). It will usually recur every time that entity exists in that state.

How to fix it

• The CULPRIT line below names the mod. Then:
• 1. Update that mod -- this class of bug gets fixed often.
• 2. If it is already current, report it upstream with this crash report.
• 3. To get the server back up NOW, remove the offending entity rather
• than the mod: the crash report's 'Entity being ticked' section gives
• its coordinates. Load the world and kill it, or temporarily disable
• that mob's spawning in the mod's config.
• MCreator-generated mods (net.mcreator.* in the trace) are especially
• prone to unguarded nulls in procedures.

How to be sure it is this

The crash report's -- Entity being ticked -- section names the entity and gives exact coordinates.

What it gets mistaken for

Looks random, because it only fires when that chunk loads. It will recur the moment someone goes back.

What to do next

The thing is still in the world, so the server will die again on restart — this is the classic restart loop. Remove it at those coordinates, or disable that mob in the mod's config.

What it looks like in your log

Search your crash report or latest.log for any of these:

Description:
Exception ticking

The free edition covers the six most common startup failures, and this is not one of them — it is in the paid tool, which checks all 24 and names the mod jar from the stack trace. The fix above is the same one it prints, so you do not need it to solve this.