diff --git a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_flame_leviathan.cpp b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_flame_leviathan.cpp
index 495e007b2e..937ccf4d5f 100644
--- a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_flame_leviathan.cpp
+++ b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_flame_leviathan.cpp
@@ -334,7 +334,8 @@ class boss_flame_leviathan : public CreatureScript
             void SpellHit(Unit* /*caster*/, SpellInfo const* spell) override
             {
                 if (spell->Id == SPELL_START_THE_ENGINE)
-                    ASSERT_NOTNULL(me->GetVehicleKit())->InstallAllAccessories(false);
+                    if (Vehicle* vehicleKit = me->GetVehicleKit())
+                        vehicleKit->InstallAllAccessories(false);
 
                 if (spell->Id == SPELL_ELECTROSHOCK)
                     me->InterruptSpell(CURRENT_CHANNELED_SPELL);