Check web middleware (barryvdh#1712)

Author: barryvdh

src/ServiceProvider.php

@@ -134,8 +134,11 @@ protected function getConfigPath()
      */
     protected function registerMiddleware($middleware)
     {
+        /** @var \Illuminate\Foundation\Http\Kernel $kernel */
         $kernel = $this->app[Kernel::class];
         $kernel->pushMiddleware($middleware);
-        $kernel->appendMiddlewareToGroup('web', $middleware);
+        if (isset($kernel->getMiddlewareGroups()['web'])) {
+            $kernel->appendMiddlewareToGroup('web', $middleware);
+        }
     }
 }