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TMap add error in singleton

Hi. guys. I'm newby in unreal. I knew singleton class setting is good for manager. So I make manager class. And I declare some sub manager class for ineventory. Then I declare TMap variable. It works when I find but when I use add or emplace, editor is killed. I did'nt use UPROPERTY as ue4 document said. I don't know what I miss. Anyone know it?

here is the code and error message

 class SAVINGGAME_API UGameManager : public UObject
 public :
  UInventoryManager* _inventoryManager; 
 //Inventory Manager
 class SAVINGGAME_API UInventoryManager : public UObject
     TMap<int, int> _itemMap;
     void AddItem(int in_itemID, int in_count = 1);
 //Add item define
 void UInventoryManager::AddItem(int in_item, int in_count)
     int* countPtr = _itemMap.Find(in_item);
     if(nullptr == countPtr)
         _itemMap.Add(in_item, in_count);
         (*countPtr) += in_count;

alt text

Product Version: UE 4.17
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asked Apr 25 '18 at 06:41 AM in C++ Programming

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