Core/Maps: Fixes nulls which unloading instance maps.

Source/Game/Maps/Instances/MapInstance.cs

@@ -45,17 +45,17 @@ namespace Game.Maps
         {
             base.Update(diff);
 
-            foreach (var i in m_InstancedMaps.ToList())
+            foreach (var pair in m_InstancedMaps.ToList())
             {
-                if (i.Value.CanUnload(diff))
+                if (pair.Value.CanUnload(diff))
                 {
-                    if (!DestroyInstance(i))
+                    if (!DestroyInstance(pair))
                     {
                         //m_unloadTimer
                     }
                 }
                 else
-                    i.Value.Update(diff);
+                    pair.Value.Update(diff);
             }
         }
 
@@ -265,6 +265,7 @@ namespace Game.Maps
                 Global.MapMgr.FreeInstanceId(pair.Value.GetInstanceId());
 
             // erase map
+            pair.Value.Dispose();
             m_InstancedMaps.Remove(pair.Key);
 
             return true;

Source/Game/Maps/Map.cs

@@ -36,7 +36,7 @@ using System.Linq;
 
 namespace Game.Maps
 {
-    public class Map
+    public class Map : IDisposable
     {
         public Map(uint id, long expiry, uint instanceId, Difficulty spawnmode, Map parent = null)
         {
@@ -86,6 +86,27 @@ namespace Game.Maps
             Global.ScriptMgr.OnCreateMap(this);
         }
 
+        public void Dispose()
+        {
+            Global.ScriptMgr.OnDestroyMap(this);
+
+            for (var i = 0; i < i_worldObjects.Count; ++i)
+            {
+                WorldObject obj = i_worldObjects[i];
+                Contract.Assert(obj.IsWorldObject());
+                obj.RemoveFromWorld();
+                obj.ResetMap();
+            }
+
+            if (!m_scriptSchedule.Empty())
+                Global.MapMgr.DecreaseScheduledScriptCount((uint)m_scriptSchedule.Count);
+
+            if (m_parentMap == this)
+                m_childTerrainMaps = null;
+
+            Global.MMapMgr.unloadMapInstance(GetId(), i_InstanceId);
+        }
+
         public static bool ExistMap(uint mapid, uint gx, uint gy)
         {
             string fileName = $"{Global.WorldMgr.GetDataPath()}/maps/{mapid:D4}_{gx:D2}_{gy:D2}.map";
@@ -1647,24 +1668,6 @@ namespace Game.Maps
             _corpsesByCell.Clear();
             _corpsesByPlayer.Clear();
             _corpseBones.Clear();
-
-            Global.ScriptMgr.OnDestroyMap(this);
-
-            for (var i = 0; i < i_worldObjects.Count; ++i)
-            {
-                WorldObject obj = i_worldObjects[i];
-                Contract.Assert(obj.IsWorldObject());
-                obj.RemoveFromWorld();
-                obj.ResetMap();
-            }
-
-            if (!m_scriptSchedule.Empty())
-                Global.MapMgr.DecreaseScheduledScriptCount((uint)m_scriptSchedule.Count);
-
-            if (m_parentMap == this)
-                 m_childTerrainMaps = null;
-
-            Global.MMapMgr.unloadMapInstance(GetId(), i_InstanceId);
         }
 
         private GridMap GetGridMap(float x, float y)

Source/Game/Maps/MapManager.cs

@@ -269,9 +269,10 @@ namespace Game.Entities
             foreach (var pair in i_maps)
                 pair.Value.UnlinkAllChildTerrainMaps();
 
-            foreach (var pair in i_maps)
+            foreach (var pair in i_maps.ToList())
             {
                 pair.Value.UnloadAll();
+                pair.Value.Dispose();
                 i_maps.Remove(pair.Key);
             }