Object is null and I don't know how fix it

Well, I'll try to be as clear as possible. I'm following a tutorial (just have some basic notion about programming) and I'm stucked. There is a point where a method to move an object should be called, but it isn't. After testing the IF's of the scripts involved I apparently found the problem. There's a if that calls the movement method isn't being properly activated (comproved by debug.log):

 public override void CliqueMouse(GameObject objetoAtingido, Vector3 posicaoAtingida, Jogador controlador)
     {
         base.CliqueMouse(objetoAtingido, posicaoAtingida, controlador); 
         Debug.Log("Its reaching here...");
         if (jogador && jogador.humano && selecaoAtual)  //The problem is here, probably in the "jogador" tests..
         {
             Debug.Log("It should be reaching here, but it isn't");
             Debug.Log("...");
                 IniciarMovimento(destino);    //Starts movement
         }
     }

My "jogador" variable is defined by the class "Jogador" below:

 public class Jogador : MonoBehaviour {
 
     public string usuario;
     public bool humano;
     public InterfaceHUD interfaceHUD;   
     public Unidades ObjetoSelecionado { get; set; }
 
 Debug.Log("[...] The rest is empty, there is just an Initialization for the HUD varible [...]");
 }

What's the properly way to test why my "jogador" variable is reaching null to the "CliqueMouse" class? I mean, is there a way to test it with Debug.log or something like that? The codes involved are much more complicated than these two parts. My "jogador" is being Initialized in another class and I don't see a way to discover where the data losts itself.