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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

 //Singleton
 UCLASS()
 class SAVINGGAME_API UGameManager : public UObject
 {
  GENERATED_BODY()
  
 public :
  UGameManager();
  UInventoryManager* _inventoryManager; 
 };
 
 //Inventory Manager
 UCLASS()
 class SAVINGGAME_API UInventoryManager : public UObject
 {
 GENERATED_BODY()
 
 public:
     TMap<int, int> _itemMap;
     
 public:
     UInventoryManager();
  
 public:
     UFUNCTION()
     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);
     }
     else
     {
         (*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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TigerFish89
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