From 47cfd6d41924c7c40416460f28f997539a6d107f Mon Sep 17 00:00:00 2001
From: hondacrx <prelude_20032002@yahoo.com>
Date: Wed, 5 Jan 2022 20:25:41 -0500
Subject: [PATCH] Core/Creatures: Fixed crash when guards get killed by
 periodic auras whose caster is offline or despawned

Port From (https://github.com/TrinityCore/TrinityCore/commit/e539de68e10a64b0f0a0619eb5213ab5315b01c9)
---
 Source/Game/AI/CoreAI/GuardAI.cs | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/Source/Game/AI/CoreAI/GuardAI.cs b/Source/Game/AI/CoreAI/GuardAI.cs
index 1d5a0c6d9..31c9a70f8 100644
--- a/Source/Game/AI/CoreAI/GuardAI.cs
+++ b/Source/Game/AI/CoreAI/GuardAI.cs
@@ -63,9 +63,12 @@ namespace Game.AI
 
         public override void JustDied(Unit killer)
         {
-            Player player = killer.GetCharmerOrOwnerPlayerOrPlayerItself();
-            if (player != null)
-                me.SendZoneUnderAttackMessage(player);
+            if (killer != null)
+            {
+                Player player = killer.GetCharmerOrOwnerPlayerOrPlayerItself();
+                if (player != null)
+                    me.SendZoneUnderAttackMessage(player);
+            }
         }
     }
 }