title: UpdateOrCreate fails to update one column
body: <p>I`m coding Facebook Login with Laravel/Socialite. </p>
  
  <p>I use UpdateOrCreate in the callback function, so if user does not exist, Laravel will create a new record, otherwise, will update some data on existing one. </p>
  
  <pre><code>public function handleProviderCallback()
      {
          $user = Socialite::driver('facebook')-&gt;stateless()-&gt;user();
  
          $key_token = $user-&gt;token;
          $key_fb = $user-&gt;getId();        
          $name = $user-&gt;getName();      
          $email = $user-&gt;getEmail(); 
          $url_photo = $user-&gt;getAvatar();   
  
          $user = User::updateOrCreate(
              [
                  'email' =&gt; $email
              ],
              [   
                  'name' =&gt; $name,
                  'key_fb' =&gt; $key_fb,
                  'url_photo' =&gt; $url_photo,
                  'ḱey_token' =&gt; $key_token,
                  'date_lastlogin' =&gt; \Carbon\Carbon::now(),
              ]
          );
  
          Auth::loginUsingId($user-&gt;id);
          return redirect('home');
  }
  </code></pre>
  
  <p><strong>But, be an Update or Create, the "key_token" is never inserted/updated. Mysql shows default value, Null. Other columns work fine.</strong> </p>
  
  <p>I checked the value of key_token and its filled in all contexts. 
  Also, the User Model $fillable array contains "key_token" . </p>
  
  <pre><code>protected $fillable = [
          'name', 'email', 'password', 'key_fb', 'url_photo', 'date_lastlogin', 'key_token',
      ];
  </code></pre>
  
  <p>I also have run the actual string (received token from FB) in the place of $key_token, but key_token continues to be filled with Null value. </p>
  
  <p>(...)</p>
  
  <pre><code> 'url_photo' =&gt; $url_photo,
   'ḱey_token' =&gt; "IjasIJ937Jdsi823KJAndksu.......",
   'date_lastlogin' =&gt; \Carbon\Carbon::now(),
  </code></pre>
  
  <p>(...)                    </p>
  
  <p>When echoing $user (from UpdateOrCreate return) , the value for key_token is Null</p>
  
  <p>What to do in order to insert/update key_token? </p>