diff --git a/src/server/scripts/Northrend/Nexus/EyeOfEternity/boss_malygos.cpp b/src/server/scripts/Northrend/Nexus/EyeOfEternity/boss_malygos.cpp
index a61e0089c..6ca80d64f 100644
--- a/src/server/scripts/Northrend/Nexus/EyeOfEternity/boss_malygos.cpp
+++ b/src/server/scripts/Northrend/Nexus/EyeOfEternity/boss_malygos.cpp
@@ -1220,8 +1220,9 @@ public:
             if (Vehicle* v = me->GetVehicle())
                 v->RemoveAllPassengers();
 
-            if (Player* player = killer->GetCharmerOrOwnerPlayerOrPlayerItself())
-                player->UpdateAchievementCriteria(ACHIEVEMENT_CRITERIA_TYPE_GET_KILLING_BLOWS, 1, 0, me);
+            if (killer)
+                if (Player* player = killer->GetCharmerOrOwnerPlayerOrPlayerItself())
+                    player->UpdateAchievementCriteria(ACHIEVEMENT_CRITERIA_TYPE_GET_KILLING_BLOWS, 1, 0, me);
         }
 
         void MoveInLineOfSight(Unit*  /*who*/) override {}