Index: views_plugin_style_chart.inc
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/views_charts/views_plugin_style_chart.inc,v
retrieving revision 1.1.2.4
diff -u -p -r1.1.2.4 views_plugin_style_chart.inc
--- views_plugin_style_chart.inc	12 Jan 2010 21:43:57 -0000	1.1.2.4
+++ views_plugin_style_chart.inc	21 Jun 2010 09:33:52 -0000
@@ -160,7 +160,7 @@ class views_plugin_style_chart extends v
     }
 
     
-    $out .= $canvas->get_chart();
+    $out = $canvas->get_chart();
     return $out;
 
   }
@@ -236,7 +236,9 @@ class views_plugin_style_chart extends v
   
             $all_relationships = $this->_get_relationships ();        
             $rel = $handler->options['relationship']; 
-            $rel = $all_relationships[$rel];
+            $rel = isset($all_relationships[$rel]) ?
+              $all_relationships[$rel] :
+              NULL;
             
             if (!empty($rel)) {
               $field_name = $rel->fieldprefix . '.' . $val->options['field']; // reserved, not used
@@ -270,7 +272,9 @@ class views_plugin_style_chart extends v
     $curr_disp = $this->view->current_display;
     
     $default_rels = $this->view->display['default']->handler->options['relationships'];
-    $curr_displ_rels = $this->view->display[$curr_disp]->handler->options['relationships'];
+    $curr_displ_rels = isset($this->view->display[$curr_disp]->handler->options['relationships']) ?
+      $this->view->display[$curr_disp]->handler->options['relationships'] :
+      NULL;
     
     $default_rels = (is_array($default_rels)) ? $default_rels : array();
     $curr_displ_rels = (is_array($curr_displ_rels)) ? $curr_displ_rels : array();