How to set a camera in a script from another script?

Question

C++ / C#

I tried to make a trigger that at the beginning of the animation of a certain object removes the player's movement script, and returns it at the end, but the movement script has a public camera and I tried to set it through the script, but I get an error

NullReferenceException: Object reference not set to an instance of an object

>

public GameObject player;
    public SC_FPSController sC_FPSController;
    public Camera camera;
...
sC_FPSController.playerCamera = camera.GetComponent<Camera>();
player.AddComponent<SC_FPSController>();
...