[Problem] Use Playerpref.GetInt in other thread

Hi! i'm having a problem using playerpref.getint in other thread created in the game. i have been trying ways of us playpref.getint in other thread for more than 8 hours.

i'm doing this:

     Thread t = new Thread(ScoresOnline);
     t.Start();

and this:

      void ScoresOnline(){
             int bestSctore = PlayerPrefs.GetInt("Score")
             scoreBoard.SaveScore(bestSctore);  
             (...)
          }

Im getting this error:

GetInt can only be called from the main thread. Constructors and field initializers will be executed from the loading thread when loading a scene. Don't use this function in the constructor or field initializers, instead move initialization code to the Awake or Start function.

Please anything that could help, would be great, i have already tried a lot of things, but not the right one. So, can you help me?