Database corruption caused by unknown spell effect

[trenhal 0]

[04:03:45 PM] INFO com.wurmonline.server.LoginHandler: /REDACTED,Phantom successfully logged on, id: REDACTED. [04:03:45 PM] SEVERE com.wurmonline.server.Server: null java.lang.NullPointerException at com.wurmonline.server.spells.SpellEffect.getName(SpellEffect.java:217) at com.wurmonline.server.creatures.Creature.sendAddSpellEffect(Creature.java:16598) at com.wurmonline.server.creatures.SpellEffects.addSpellEffect(SpellEffects.java:103) at com.wurmonline.server.creatures.SpellEffects.<init>(SpellEffects.java:67) at com.wurmonline.server.creatures.Creature.createSpellEffects(Creature.java:16668) at com.wurmonline.server.LoginHandler.loadPlayer(LoginHandler.java:2420) at com.wurmonline.server.Server.sendFinals(Server.java:2769) at com.wurmonline.server.Server.run(Server.java:2453) at java.util.TimerThread.mainLoop(Timer.java:555) at java.util.TimerThread.run(Timer.java:505)

 

Whenever Phantom logs on, this error happens, and it has caused the database to go completely FUBAR.

Restoring backups only help until he logs on.

It is not caused by a malicious action by either player and it is not caused by using the server mod loader as it happens without it.