Why 0xC0000005 error occur when I use uobject derived class that include tmap without uproperty

Development Programming & Scripting
1

Hi. I had a problem.
When I run my game, my game dead soon. I don’t know why my game dead shortly even I tried null point check when code excuted. For example. I don’t use uproperty at below code at _StateController.

UCLASS()
    class SAVINGGAME_API ABaseCharacter : public ACharacter, public IDamageInterface
    {
    	GENERATED_BODY()
    
    	UBaseChracterStateController* _StateController;	 
    }

But when I declare UPROPERTY on the _StateController that uobject derived class and include TMap. My game become stable.
I don’t know why it is fixed. Please. Let me know when I must use uproperty and how it work in code? here is my code.

ABaseCharacter.h

UCLASS()
class SAVINGGAME_API ABaseCharacter : public ACharacter, public IDamageInterface
{
	GENERATED_BODY()

	UPROPERTY()
	UBaseChracterStateController* _StateController;	 
}

UBaseCharacterStateController.h

UCLASS()
class SAVINGGAME_API UBaseChracterStateController : public UObject
{
	GENERATED_BODY()

protected:
	UPROPERTY()
	TMap<ECharacterState, UBaseCharacterState*> stateMap;
}