DrawDefaultInspector crash

 [CustomEditor(typeof(PlayerController))]
 public class PlayerEditor : Editor 
 {
     string[] CHARACTER_TYPE = {"NULL", "Frog", "Snake", "Armadillo"};
     public PlayerController m_player;
 
     public int Type
     {
         get 
         { 
             for(int i = 0; i < CHARACTER_TYPE.Length; ++i)
                 if(CHARACTER_TYPE[i] == m_player.Type())
                     return i;
             return 0;
         }
         set
         {
             if (value == Type || value <= 0)
                 return;
 
             GameObject newPlayer = (GameObject)Instantiate(Resources.Load("Prefabs/" + CHARACTER_TYPE[value], typeof(GameObject)), m_player.transform.position, m_player.transform.rotation);
             Debug.Log(newPlayer);
             DestroyImmediate(m_player.gameObject);
             m_player = newPlayer.GetComponent<PlayerController>();
             Selection.activeGameObject = newPlayer;
             newPlayer.name = "player";
         }
     }
 
 
 
     virtual public void OnEnable()
     {
         m_player = (PlayerController)target;
     }
 
     public override void OnInspectorGUI()
     {
         DrawPlayerGUI();
     }
 
     public void DrawPlayerGUI()
     {
         Type = EditorGUILayout.Popup("Type", Type, CHARACTER_TYPE, GUILayout.ExpandWidth(true));
         DrawDefaultInspector();
     }
 }