diff --git a/gmap_location.module b/gmap_location.module
index 3197831..3c13504 100644
--- a/gmap_location.module
+++ b/gmap_location.module
@@ -694,7 +694,7 @@ function gmap_location_block_view($delta = '') {
 function _gmap_location_block_view($nid) {
   $block = array();
   $node = node_load($nid);
-  if ($node->locations) {
+  if (isset($node->locations) && $node->locations) {
     $markertypes = variable_get('gmap_node_markers', array());
     $markers = array();
     $count = 0;