check if resolved

src/Illuminate/Auth/AuthServiceProvider.php

@@ -17,13 +17,9 @@ class AuthServiceProvider extends ServiceProvider
     public function register()
     {
         $this->registerAuthenticator();
-
         $this->registerUserResolver();
-
         $this->registerAccessGate();
-
         $this->registerRequestRebindHandler();
-
         $this->registerEventRebindHandler();
     }
 
@@ -77,7 +73,7 @@ protected function registerAccessGate()
     }
 
     /**
-     * Register a resolver for the authenticated user.
+     * Handle the re-binding of the request binding.
      *
      * @return void
      */
@@ -91,15 +87,18 @@ protected function registerRequestRebindHandler()
     }
 
     /**
-     * Register a resolver for the 'events' rebinding.
+     * Handle the re-binding of the event dispatcher binding.
      *
      * @return void
      */
     protected function registerEventRebindHandler()
     {
         $this->app->rebinding('events', function ($app, $dispatcher) {
-            $guard = $app['auth']->guard();
-            if (method_exists($guard, 'setDispatcher')) {
+            if (! $app->resolved('auth')) {
+                return;
+            }
+
+            if (method_exists($guard = $app['auth']->guard(), 'setDispatcher')) {
                 $guard->setDispatcher($dispatcher);
             }
         });