diff --git a/src/game/Group.cpp b/src/game/Group.cpp
index e0cd4a65e..b8ae12046 100644
--- a/src/game/Group.cpp
+++ b/src/game/Group.cpp
@@ -1168,6 +1168,7 @@ bool Group::_addMember(ObjectGuid guid, const char* name, bool isAssistant, uint
     member.name      = name;
     member.group     = group;
     member.assistant = isAssistant;
+    member.lastMap   = player->GetMapId();
     m_memberSlots.push_back(member);
 
     SubGroupCounterIncrease(group);
@@ -1667,9 +1668,21 @@ bool Group::InCombatToInstance(uint32 instanceId)
     return false;
 }
 
+bool Group::SetPlayerMap(const ObjectGuid guid, uint32 mapid)
+{
+    member_witerator slot = _getMemberWSlot(guid);
+    if (slot != m_memberSlots.end())
+    {
+        slot->lastMap = mapid;
+        DEBUG_LOG("Group::SetPlayerMap> map is updated");
+        return true;
+    }
+    return false;
+}
+
 void Group::ResetInstances(InstanceResetMethod method, bool isRaid, Player* SendMsgTo)
 {
-    if(isBGGroup())
+    if (isBGGroup())
         return;
 
     // method can be INSTANCE_RESET_ALL, INSTANCE_RESET_CHANGE_DIFFICULTY, INSTANCE_RESET_GROUP_DISBAND
@@ -1677,17 +1690,30 @@ void Group::ResetInstances(InstanceResetMethod method, bool isRaid, Player* Send
     // we assume that when the difficulty changes, all instances that can be reset will be
     Difficulty diff = GetDifficulty(isRaid);
 
-    for(BoundInstancesMap::iterator itr = m_boundInstances[diff].begin(); itr != m_boundInstances[diff].end();)
+    typedef std::set<uint32> OfflineMapSet;
+    OfflineMapSet mapsWithOfflinePlayer;                    // to store map of offline players
+
+    if (method != INSTANCE_RESET_GROUP_DISBAND)
     {
-        DungeonPersistentState *state = itr->second.state;
-        const MapEntry *entry = sMapStore.LookupEntry(itr->first);
+        // Store maps in which are offline members for instance reset check.
+        for (member_citerator itr = m_memberSlots.begin(); itr != m_memberSlots.end(); ++itr)
+        {
+            if (!ObjectAccessor::FindPlayer(itr->guid))
+                mapsWithOfflinePlayer.insert(itr->lastMap); // add last map from offline player
+        }
+    }
+
+    for (BoundInstancesMap::iterator itr = m_boundInstances[diff].begin(); itr != m_boundInstances[diff].end();)
+    {
+        DungeonPersistentState* state = itr->second.state;
+        const MapEntry* entry = sMapStore.LookupEntry(itr->first);
         if (!entry || entry->IsRaid() != isRaid || (!state->CanReset() && method != INSTANCE_RESET_GROUP_DISBAND))
         {
             ++itr;
             continue;
         }
 
-        if(method == INSTANCE_RESET_ALL)
+        if (method == INSTANCE_RESET_ALL)
         {
             // the "reset all instances" method can only reset normal maps
             if (entry->map_type == MAP_RAID || diff == DUNGEON_DIFFICULTY_HEROIC)
@@ -1698,9 +1724,13 @@ void Group::ResetInstances(InstanceResetMethod method, bool isRaid, Player* Send
         }
 
         bool isEmpty = true;
-        // if the map is loaded, reset it
-        if (Map *map = sMapMgr.FindMap(state->GetMapId(), state->GetInstanceId()))
-            if (map->IsDungeon() && !(method == INSTANCE_RESET_GROUP_DISBAND && !state->CanReset()))
+        // check if there are offline members on the map
+        if (method != INSTANCE_RESET_GROUP_DISBAND && mapsWithOfflinePlayer.find(state->GetMapId()) != mapsWithOfflinePlayer.end())
+            isEmpty = false;
+
+        // if the map is loaded, reset it if can
+        if (isEmpty && entry->IsDungeon() && !(method == INSTANCE_RESET_GROUP_DISBAND && !state->CanReset()))
+            if (Map* map = sMapMgr.FindMap(state->GetMapId(), state->GetInstanceId()))
                 isEmpty = ((DungeonMap*)map)->Reset(method);
 
         if (SendMsgTo)
@@ -1711,6 +1741,7 @@ void Group::ResetInstances(InstanceResetMethod method, bool isRaid, Player* Send
                 SendMsgTo->SendResetInstanceFailed(0, state->GetMapId());
         }
 
+        // TODO - Adapt here when clear how difficulty changes must be handled
         if (isEmpty || method == INSTANCE_RESET_GROUP_DISBAND || method == INSTANCE_RESET_CHANGE_DIFFICULTY)
         {
             // do not reset the instance, just unbind if others are permanently bound to it
diff --git a/src/game/Group.h b/src/game/Group.h
index b67438937..5599ea9b0 100644
--- a/src/game/Group.h
+++ b/src/game/Group.h
@@ -195,6 +195,7 @@ class MANGOS_DLL_SPEC Group
             std::string name;
             uint8       group;
             bool        assistant;
+            uint32      lastMap;
         };
         typedef std::list<MemberSlot> MemberSlotList;
         typedef MemberSlotList::const_iterator member_citerator;
@@ -203,7 +204,6 @@ class MANGOS_DLL_SPEC Group
     protected:
         typedef MemberSlotList::iterator member_witerator;
         typedef std::set<Player*> InvitesList;
-
         typedef std::vector<Roll*> Rolls;
 
     public:
@@ -339,6 +339,8 @@ class MANGOS_DLL_SPEC Group
 
         void RewardGroupAtKill(Unit* pVictim, Player* player_tap);
 
+        bool SetPlayerMap(const ObjectGuid guid, uint32 mapid);
+
         /*********************************************************/
         /***                   LOOT SYSTEM                     ***/
         /*********************************************************/
diff --git a/src/game/Player.cpp b/src/game/Player.cpp
index aafc4e8a8..2c378d82e 100644
--- a/src/game/Player.cpp
+++ b/src/game/Player.cpp
@@ -1659,6 +1659,9 @@ bool Player::TeleportTo(uint32 mapid, float x, float y, float z, float orientati
         DEBUG_LOG("Player %s is being teleported to map %u", GetName(), mapid);
     }
 
+    if (Group* grp = GetGroup())
+        grp->SetPlayerMap(GetObjectGuid(), mapid);
+
     // if we were on a transport, leave
     if (!(options & TELE_TO_NOT_LEAVE_TRANSPORT) && m_transport)
     {
diff --git a/src/shared/revision_nr.h b/src/shared/revision_nr.h
index 4a8d3913a..577580c2c 100644
--- a/src/shared/revision_nr.h
+++ b/src/shared/revision_nr.h
@@ -1,4 +1,4 @@
 #ifndef __REVISION_NR_H__
 #define __REVISION_NR_H__
- #define REVISION_NR "11897"
+ #define REVISION_NR "11898"
 #endif // __REVISION_NR_H__