From dca406aa6444c39f630ec67497890c5d1f2d27af Mon Sep 17 00:00:00 2001
From: Larry Garfield <larry@garfieldtech.com>
Date: Sat, 11 Aug 2012 23:45:08 -0500
Subject: [PATCH] Only try to rebuild the router table if the dumper is
 actually available.

---
 core/includes/common.inc | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/core/includes/common.inc b/core/includes/common.inc
index 6300dece78..b75185e236 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -4,6 +4,7 @@
 use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 use Drupal\Core\Cache\CacheBackendInterface;
+use Symfony\Component\DependencyInjection\Container;
 use Drupal\Core\Database\Database;
 use Drupal\Core\Template\Attribute;
 
@@ -6846,13 +6847,15 @@ function router_rebuild() {
   // a given item came from.
   $callbacks = array();
 
-  $dumper = drupal_container()->get('router.dumper');
+  $dumper = drupal_container()->get('router.dumper', Container::NULL_ON_INVALID_REFERENCE);
 
-  foreach (module_implements('route_info') as $module) {
-    $routes = call_user_func($module . '_route_info');
-    drupal_alter('router_info', $routes);
-    $dumper->addRoutes($routes);
-    $dumper->dump(array('route_set' => $module));
+  if ($dumper) {
+    foreach (module_implements('route_info') as $module) {
+      $routes = call_user_func($module . '_route_info');
+      drupal_alter('router_info', $routes);
+      $dumper->addRoutes($routes);
+      $dumper->dump(array('route_set' => $module));
+    }
   }
 }
 
-- 
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