NullReferenceException when build

I get an error like this when I build a game. when run in the editor, the game will run smoothly, but when running a game that has been created, the game will get stuck and display a message in the output log.

I have checked the object variable on the component, it's assigned with the image and text. but why do I still get an error like this. I do not understand, I see no errors in my code. everything is in order. Here is the component :

Here is some sample code :

 public GameObject textWait;
 public Image playerParangLogo;
 
 // Update is called once per frame
     void Update () {
         //AmbientSound ();
         if (combatScript.swordState) {
             if (playerParangLogo != null){
                 if (!playerParangLogo.enabled) {
                     playerParangLogo.gameObject.SetActive (true);
                 }
             }
         } else {
             if (playerParangLogo != null) {
                 if (playerParangLogo.enabled) {
                     playerParangLogo.gameObject.SetActive (false);
                 }
             } else {
                 Debug.Log ("null");
             }
         }
 
         if (waitingForKey)
             textWait.gameObject.SetActive (true);
         else
             textWait.gameObject.SetActive (false);
     }

to see the full code, visit this link : Full Code

does anyone know why i'm keep getting this error ??