--- kernel/classes/ezcontentobjectversion.php 
+++ extension/kernel_patches/classes/ezcontentobjectversion.php 
@@ -611,17 +611,20 @@
                                 foreach( $this->attribute( 'node_assignments' ) as $nodeAssignment )
                                 {
                                     $parentNode = $nodeAssignment->attribute( 'parent_node_obj' );
-                                    $path = $parentNode->attribute( 'path_string' );
-                                    $subtreeArray = $limitation;
-                                    foreach ( $subtreeArray as $subtreeString )
-                                    {
-                                        if ( strstr( $path, $subtreeString ) )
-                                        {
-                                            $access = 'allowed';
-                                            $accessSubtree = true;
-                                            break;
-                                        }
-                                    }
+									if ( $parentNode )
+									{                                    
+		                                $path = $parentNode->attribute( 'path_string' );
+		                                $subtreeArray = $limitation;
+		                                foreach ( $subtreeArray as $subtreeString )
+		                                {
+		                                    if ( strstr( $path, $subtreeString ) )
+		                                    {
+		                                        $access = 'allowed';
+		                                        $accessSubtree = true;
+		                                        break;
+		                                    }
+		                                }
+									}
                                     if ( $access == 'allowed' )
                                     {
                                         break;
@@ -664,17 +667,20 @@
                                 foreach( $this->attribute( 'node_assignments' ) as $nodeAssignment )
                                 {
                                     $parentNode = $nodeAssignment->attribute( 'parent_node_obj' );
-                                    $path = $parentNode->attribute( 'path_string' );
-                                    $subtreeArray = $limitation;
-                                    foreach ( $subtreeArray as $subtreeString )
-                                    {
-                                        if ( strstr( $path, $subtreeString ) )
-                                        {
-                                            $access = 'allowed';
-                                            break;
-                                        }
-                                    }
-                                    if ( $access == 'allowed' )
+									if ( $parentNode )
+									{                                    
+										$path = $parentNode->attribute( 'path_string' );
+		                                $subtreeArray = $limitation;
+		                                foreach ( $subtreeArray as $subtreeString )
+		                                {
+		                                    if ( strstr( $path, $subtreeString ) )
+		                                    {
+		                                        $access = 'allowed';
+		                                        break;
+		                                    }
+		                                }
+									}                                    
+									if ( $access == 'allowed' )
                                     {
                                         break;
                                     }