Server is Restarting itself

[Kaol]

Server Crash Report
===================

ServUO Version 0.5, Build 7153.5666
Operating System: Microsoft Windows NT 6.2.9200.0
.NET Framework: 4.0.30319.42000
Time: 05/08/2019 17:59:08
Mobiles: 42528
Items: 212627
Exception:
System.ArgumentOutOfRangeException: The added or subtracted value results in an un-representable DateTime.
Parameter name: t
   at System.DateTime.op_Addition(DateTime d, TimeSpan t)
   at Server.Misc.SkillCheck.CheckStatTimer(Mobile from, Stat stat)
   at Server.Misc.SkillCheck.TryStatGain(SkillInfo info, Mobile from)
   at Server.Misc.SkillCheck.Gain(Mobile from, Skill skill)
   at Server.Misc.SkillCheck.CheckSkill(Mobile from, Skill skill, Object amObj, Double chance)
   at Server.Misc.SkillCheck.Mobile_SkillCheckLocation(Mobile from, SkillName skillName, Double minSkill, Double maxSkill)
   at Server.Mobiles.XmlSpawnerSkillCheck.Mobile_SkillCheckLocation(Mobile from, SkillName skillName, Double minSkill, Double maxSkill)
   at Server.Mobile.CheckSkill(SkillName skill, Double minSkill, Double maxSkill)
   at Server.Items.BaseWeapon.ScaleDamageAOS(Mobile attacker, Double damage, Boolean checkSkills)
   at Server.Items.BaseWeapon.ComputeDamageAOS(Mobile attacker, Mobile defender)
   at Server.Items.BaseWeapon.OnHit(Mobile attacker, IDamageable damageable, Double damageBonus)
   at Server.Items.BaseAxe.OnHit(Mobile attacker, IDamageable defender, Double damageBonus)
   at Server.Items.BaseWeapon.OnSwing(Mobile attacker, IDamageable damageable, Double damageBonus)
   at Server.Items.DoubleStrike.OnHit(Mobile attacker, Mobile defender, Int32 damage)
   at Server.Items.BaseWeapon.OnHit(Mobile attacker, IDamageable damageable, Double damageBonus)
   at Server.Items.BaseAxe.OnHit(Mobile attacker, IDamageable defender, Double damageBonus)
   at Server.Items.BaseWeapon.OnSwing(Mobile attacker, IDamageable damageable, Double damageBonus)
   at Server.Mobile.CombatTimer.OnTick()
   at Server.Timer.Slice()
   at Server.Core.Main(String[] args)

im using classic client latest version. This crash happens when i fight and kill mobs