Bug: "Cannot loot this right now" in Master loot mode

I think I found another bug related to looting. Here's how I reproduce it:

• Create two bots(I believe it's also the same issue with real players, but I don't have a friend to play with me  )
• Have them all accept a quest to collect some items
• change the loot mode to master loot.
• Whenever you or the bots try to loot the quest item, you will get the error "Cannot loot this right now".
   

Workaround: just change to other loot mode when you are working on that quest

Potential fix: I am not sure if I understand the code correctly, but the following fix works so far(for couple of hours of playing)

@@ -144,8 +144,14 @@ void WorldSession::HandleAutostoreLootItemOpcode(WorldPacket& recv_data)
             }
             case MASTER_LOOT:
             {
-                if((item->winner && item->winner != player->GetObjectGuid()) || (!item->winner && !item->is_underthreshold && !item->freeforall))
+                if((item->winner && item->winner != player->GetObjectGuid())
+                    || (!item->winner && !item->is_underthreshold && !item->freeforall && !qitem))
                 {
+                    // below is just to show the item flags for debugging.
+                    sLog.outError("winner=%s, player=%s, is_underthreshold=%d, freeforall=%d",
+                                   item->winner.GetString().c_str(),
+                                   player->GetObjectGuid().GetString().c_str(),
+                                   item->is_underthreshold,
+                                   item->freeforall);
                     player->SendEquipError(EQUIP_ERR_LOOT_CANT_LOOT_THAT_NOW, NULL, NULL, item->itemid);
                     return;
                 }