fix(Core): Crashfix. (#12581)

src/server/game/Entities/Totem/Totem.cpp

@@ -116,7 +116,8 @@ void Totem::UnSummon(uint32 msTime)
     CombatStop();
     RemoveAurasDueToSpell(GetSpell(), GetGUID());
 
-    Unit* owner = GetOwner();
+    if (Unit* owner = GetOwner())
+    {
         // clear owner's totem slot
         for (uint8 i = SUMMON_SLOT_TOTEM; i < MAX_TOTEM_SLOT; ++i)
         {
@@ -151,6 +152,7 @@ void Totem::UnSummon(uint32 msTime)
                 }
             }
         }
+    }
 
     AddObjectToRemoveList();
 }