Temp fix of crash caused by npc_brunnhildar_prisoner script. Solve #2825, #2880 and #2772.

src/server/scripts/Northrend/storm_peaks.cpp

@@ -558,7 +558,7 @@ public:
     {
         npc_brunnhildar_prisonerAI(Creature* creature) : ScriptedAI(creature) {}
 
-        Unit* drake;
+        uint64 drakeGUID;
         uint16 enter_timer;
         bool hasEmptySeats;
 
@@ -566,14 +566,25 @@ public:
         {
             me->CastSpell(me, SPELL_ICE_PRISON, true);
             enter_timer = 0;
-            drake = NULL;
+            drakeGUID = 0;
             hasEmptySeats = false;
         }
 
         void UpdateAI(const uint32 diff)
         {
+            //TODO: not good script
+            if (!drakeGUID)
+                return;
+
+            Creature* drake = Unit::GetCreature(*me, drakeGUID);
+            if (!drake)
+            {
+                drakeGUID = 0;
+                return;
+            }
+
             // drake unsummoned, passengers dropped
-            if (drake && !me->IsOnVehicle(drake) && !hasEmptySeats)
+            if (!me->IsOnVehicle(drake) && !hasEmptySeats)
                 me->ForcedDespawn(3000);
 
             if (enter_timer <= 0)
@@ -593,9 +604,16 @@ public:
 
         void MoveInLineOfSight(Unit* unit)
         {
-            if (!unit || !drake)
+            if (!unit || !drakeGUID)
                 return;
 
+            Creature* drake = Unit::GetCreature(*me, drakeGUID);
+            if (!drake)
+            {
+                drakeGUID = 0;
+                return;
+            }
+
             if (!me->IsOnVehicle(drake) && !me->HasAura(SPELL_ICE_PRISON))
             {
                 if (unit->IsVehicle() && me->IsWithinDist(unit, 25.0f, true) && unit->ToCreature() && unit->ToCreature()->GetEntry() == 29709)
@@ -651,7 +669,7 @@ public:
             enter_timer = 500;
 
             if (hitter->IsVehicle())
-                drake = hitter;
+                drakeGUID = hitter->GetGUID();
             else
                 return;