Laravel 5: Trying to get property of non-object error with relationships

Im running the latest version of Laravel. I am trying to set up relationships with tables but I seem to always get some sort of error. The data that I want to be displayed is displayed but then under everything there is a big error saying:

ErrorException in routes.php line 26: Trying to get property of non-object

In my routes.php file this is the code:

 Route::get('select', function() {
 $users = App\UserInfo::all();

   foreach ($users as $u) {
       echo $u->userID.' USERNAME: '.$u->userData->username.'<br/>';
       echo $u->userOption->dis_joindate.'<br/>'; // Line 26
  }
 });

Line 25 seems to work fine printing no errors, though the next line gives the object error.

This is my UserInfo Model php file:

And this is my Options Model php file:

All that my database supplies (in the useroptions table) is and id, userID, dis_joindate, dis_location, dis_posts and dis_likes. And the last 4 colums just give text.

This is the image of the output on the page when all this is ran:

via Chebli Mohamed