Using Row from DataTable in OnConstruction c++ resulting in error: " EXCEPTION_ACCESS_VIOLATION"

[Tarkin1230]

Hello there. I’m following a tutorial from the YouTube, a guy make it in blueprint and im trying to make a copy of it in c++. He created FunctionLibrary Blueprint with getting data row like this:

And later on, he uses it in a blueprint actor in construction like this:

So he calls to data table on construction right?
I tried to make it in c++ but it’s not working and i dont understand why. I followed a guide about making one file for data tables like this:
DataTables.h

class TURNBASERPG_API UDataTables : public UObject
{
	GENERATED_BODY()

public:
	UDataTables();
	static UDataTables* GetInstance();
	
	TArray<FGridShapeData*> GetGridShapes() const;
	
	UDataTable* GetGridTable() const { return GridTable; }
	void SetGridTable(UDataTable* Value) { GridTable = Value; }
	
private:
	static UDataTables* Instance;
	
	UPROPERTY()
	UDataTable* GridTable;
};

DataTable.cpp

UDataTables* UDataTables::Instance;

UDataTables::UDataTables()
{
	static ConstructorHelpers::FObjectFinder<UDataTable>
		GridDataTable(TEXT("MyPathThatIWantedToHide, it works in other places"));

	SetGridTable(GridDataTable.Object);
}

UDataTables* UDataTables::GetInstance()
{
	if (Instance == nullptr)
	{
		Instance = NewObject<UDataTables>();
	}

	return Instance;
}

TArray<FGridShapeData*> UDataTables::GetGridShapes() const
{
	TArray<FGridShapeData*> GridShapes;
	GetGridTable()->GetAllRows<FGridShapeData>(TEXT("Test"), GridShapes);
	return GridShapes;
}

Then i created FunctionLibrary.h and .cpp (i think it’s only important to paste a function from .cpp):

FGridShapeData* UFunctionLibrary::GetGridShapeData(const EGridShape GridShape)
{
	const UDataTables* Instance = UDataTables::GetInstance();
	TArray<FGridShapeData*> GridShapesData = Instance->GetGridShapes();
	for (FGridShapeData* GridShapeData : GridShapesData)
	{
		if (GridShapeData->GridShape == GridShape)
		{
			return GridShapeData;
		}
	}
	return GridShapesData[0];
}

And finally I made a GridModifier actor where i want to use this GetGridShapeData in OnConstruct (like blueprint guy did) .cpp:

const FGridShapeData* GridShapeData = UFunctionLibrary::GetGridShapeData(Shape);
	StaticMeshComponent->SetStaticMesh(GridShapeData->Mesh);

But it crushes and gives me UE error “EXCEPTION_ACCESS_VIOLATION”, why is that? Is DataTable not ready yet? I used this function in blueprint in different place and it was working correctly.
Can i somehow skip first few seconds until everything is loaded so i can use it? I would like to change those variables in editor and the blueprint would change accordingly (like changing a color and or smt like that), when making pure blueprint it works, but in c++ it doesnt, what am i missing?