I have created an actor cpp class called gun base. for some reason it is causing a perpetual crash in unreal.

this is its header file.

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "GunBase.generated.h"

UCLASS()
class GIZMOSHOOTER_API AGunBase : public AActor
{
    GENERATED_BODY()
    
public: 
    // Sets default values for this actor's properties
    AGunBase();

protected:
    // Called when the game starts or when spawned
    virtual void BeginPlay() override;

public: 
    // Called every frame
    virtual void Tick(float DeltaTime) override;
    //virtual void PullTrigger();

private:

    UPROPERTY(EditDefaultsOnly)
    USoundBase* FireSound;
    UPROPERTY(EditDefaultsOnly)
    UParticleSystem* MuzzleFlash;

    UPROPERTY(EditDefaultsOnly)
    USceneComponent* RootSceneComponent = nullptr;
    UPROPERTY(EditDefaultsOnly)
    UStaticMeshComponent* GunMesh = nullptr;
    UPROPERTY(EditDefaultsOnly)
    USceneComponent* BulletSpawnPoint = nullptr;
};

and this is the cpp file.

// Fill out your copyright notice in the Description page of Project Settings.


#include "GunBase.h"
#include <Components/StaticMeshComponent.h>
#include <Components/SceneComponent.h>

// Sets default values
AGunBase::AGunBase()
{
    // Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
    PrimaryActorTick.bCanEverTick = true;
    RootSceneComponent = CreateDefaultSubobject<USceneComponent>(TEXT("Root"));
    RootSceneComponent->SetupAttachment(RootComponent);
    GunMesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("Mesh"));
    GunMesh->SetupAttachment(RootSceneComponent);
    BulletSpawnPoint->SetupAttachment(GunMesh);  //This is the line its complaining about
}

// Called when the game starts or when spawned
void AGunBase::BeginPlay()
{
    Super::BeginPlay();
    
}

// Called every frame
void AGunBase::Tick(float DeltaTime)
{
    Super::Tick(DeltaTime);

}

The crash is saying something about an exception access violation, and in particular is referencing line seventeen on the cpp file which has a comment on it. Just in case this means something, I have tried several things to get this code to work, I then builded it, and tried to open the project in unreal again but i always got a crash. thanks.