diff --git a/src/server/scripts/Northrend/Naxxramas/boss_kelthuzad.cpp b/src/server/scripts/Northrend/Naxxramas/boss_kelthuzad.cpp
index a6d60dde7..dcfb1c5e7 100644
--- a/src/server/scripts/Northrend/Naxxramas/boss_kelthuzad.cpp
+++ b/src/server/scripts/Northrend/Naxxramas/boss_kelthuzad.cpp
@@ -203,8 +203,11 @@ public:
             summons.DespawnAll();
             Talk(SAY_DEATH);
 
-            if (GameObject* go = me->GetMap()->GetGameObject(pInstance->GetData64(DATA_KELTHUZAD_GATE)))
-                go->SetGoState(GO_STATE_ACTIVE);
+            if (pInstance)
+            {
+                if (GameObject* go = me->GetMap()->GetGameObject(pInstance->GetData64(DATA_KELTHUZAD_GATE)))
+                    go->SetGoState(GO_STATE_ACTIVE);
+            }
         }
 
         void MoveInLineOfSight(Unit* who)
diff --git a/src/server/scripts/Northrend/Naxxramas/boss_maexxna.cpp b/src/server/scripts/Northrend/Naxxramas/boss_maexxna.cpp
index 19359d5f9..255ccad1a 100644
--- a/src/server/scripts/Northrend/Naxxramas/boss_maexxna.cpp
+++ b/src/server/scripts/Northrend/Naxxramas/boss_maexxna.cpp
@@ -80,8 +80,12 @@ public:
             BossAI::Reset();
             events.Reset();
             summons.DespawnAll();
-            if (GameObject* go = me->GetMap()->GetGameObject(pInstance->GetData64(DATA_MAEXXNA_GATE)))
-                go->SetGoState(GO_STATE_ACTIVE);
+
+            if (pInstance)
+            {
+                if (GameObject* go = me->GetMap()->GetGameObject(pInstance->GetData64(DATA_MAEXXNA_GATE)))
+                    go->SetGoState(GO_STATE_ACTIVE);
+            }
         
         }