Hi all, Any clue what may have cause this?

ServUO Version 0.5, Build 6591.36173
Operating System: Unix 4.9.0.5
.NET Framework: 4.0.30319.42000
Time: 2/3/2018 4:17:44 AM
Mobiles: 179250
Items: 1896354
Exception:
System.NullReferenceException: Object reference not set to an instance of an object
at Server.Mobiles.MonstrousInterredGrizzle.CacophonicAttack (Server.Mobile to) [0x00014] in <fbcd7327a32a47d0a7dd4f99c05ee6e2>:0
at Server.Mobiles.MonstrousInterredGrizzle.OnDamage (System.Int32 amount, Server.Mobile from, System.Boolean willKill) [0x00013] in <fbcd7327a32a47d0a7dd4f99c05ee6e2>:0
at Server.Mobile.Damage (System.Int32 amount, Server.Mobile from, System.Boolean informMount, System.Boolean checkDisrupt) [0x001ff] in <d8531c84ee7a46c79a697038fdef61b0>:0
at Server.Mobiles.BaseCreature.Damage (System.Int32 amount, Server.Mobile from, System.Boolean informMount, System.Boolean checkDisrupt) [0x00058] in <fbcd7327a32a47d0a7dd4f99c05ee6e2>:0
at Server.Mobiles.BaseCreature.Damage (System.Int32 amount, Server.Mobile from) [0x00000] in <fbcd7327a32a47d0a7dd4f99c05ee6e2>:0
at Server.Mobile.Damage (System.Int32 amount) [0x00000] in <d8531c84ee7a46c79a697038fdef61b0>:0
at Server.Spells.SpellHelper+SpellDamageTimer.OnTick () [0x00058] in <fbcd7327a32a47d0a7dd4f99c05ee6e2>:0
at Server.Timer.Slice () [0x00047] in <d8531c84ee7a46c79a697038fdef61b0>:0
at Server.Core.Main (System.String[] args) [0x0056c] in <d8531c84ee7a46c79a697038fdef61b0>:0
 
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