Webplayer: Why can't we call private member function from a constructor?

I have

 class Command {
 
    private var name : String;
 
 
    function Command(input : String) {
          Validate(input);
    }
    private function Validate(input : String) {
          if(input.Contains(" ")) {
             var trimmed : String = Regex.Relpace("\\s+", " ");
          } else {
              this.name = input;
          }
    }      
 }

It runs well in Unity Editor but complains in the WebBuilds when I attach the debugger. If I don't attach debugger, it crashes. Does anyone know why we can execute private member in Editor but not in WebPlayer? Or, does it specifically crashes in my machine?