Headbob is not working after camera shaking c# Firstperson

Hi! I'm making a first person game so i use the free asset package from the Unity. My problem is i put camera shaking script inside the camera of my first person character because in my game there is a situation that the ground will shake and you're going to die. The Camera shaking script is working and the game looks like the environment is shaking but after the shaking of the camera the HeadBob is not working anymore when i run. The headbob is working before the camera shaking when i run. I dont know how to fix it because i just placed the asset package and the first person character into my scene and play it.

 public Transform camTransform;
     
     // How long the object should shake for.
     public float shake = 0f;
     
     // Amplitude of the shake. A larger value shakes the camera harder.
     public float shakeAmount = 0.7f;
     public float decreaseFactor = 1.0f;
     
     Vector3 originalPos;
 
     void Awake()
     {
         if (camTransform == null)
         {
             camTransform = GetComponent(typeof(Transform)) as Transform;
         }
     }
     
     void OnEnable()
     {
         originalPos = camTransform.localPosition;
     }
     
     void Update()
     {
 
         if (CoffeemakingButton.ShouldCameraShake)
         {
             if (shake > 0) {
                 camTransform.localPosition = originalPos + Random.insideUnitSphere * shakeAmount;
                 shake -= Time.deltaTime * decreaseFactor;
             } else {
                 shake = 0f;
                 camTransform.localPosition = originalPos;
             }
         }
 
     }