Set texture / EnableKeyword not working in build

Hello. I have a script that changes a gameobject's normal map when it's damaged, and it works perfectly fine in the editor. However, when i build the project, it just doesnt work at all. It doesnt show any errors too, as i have a script that logs them in the build. Here are the important parts of the script:

 private void Start()
         {
             gameObject.GetComponent<Renderer>().material.EnableKeyword("_NORMALMAP");
         }
     private void OnCollisionEnter(Collision col)
         {
             if(hp < maxhp * .66f && !crack1)
             {
                 crack1 = true;
                 gameObject.GetComponent<Renderer>().material.SetTexture("_BumpMap", Resources.Load("Crash1Map") as Texture);
                 print("Crack1 procceeded, the texture is: " + Resources.Load("Crash1Map").name);
             }
             if (hp < maxhp * .33f && !crack2)
             {
                 crack2 = true;
                 gameObject.GetComponent<Renderer>().material.SetTexture("_BumpMap", Resources.Load("Crash2Map") as Texture);
                 print("Crack2 procceeded, the texture is: " + Resources.Load("Crash1Map").name);
             }
         }