Index: modules/node/node.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/node/node.module,v
retrieving revision 1.1004
diff -u -p -r1.1004 node.module
--- modules/node/node.module	20 Dec 2008 18:24:38 -0000	1.1004
+++ modules/node/node.module	29 Dec 2008 14:42:55 -0000
@@ -2300,6 +2300,10 @@ function node_access_grants($op, $accoun
  * Determine whether the user has a global viewing grant for all nodes.
  */
 function node_access_view_all_nodes() {
+  // Return early if no modules implement the node access system.
+  if (!module_implements('node_grants')) {
+    return TRUE;
+  }
   static $access;
 
   if (!isset($access)) {