Index: manticore.module
===================================================================
--- manticore.module	(revision 26726)
+++ manticore.module	(working copy)
@@ -181,7 +181,7 @@
   foreach ($fields as $variablename => $contactfield) {
     $userfield = variable_get('manticore_' . $variablename, '');
     if (!empty($userfield)) {
-      $contact[$contactfield] = $user->$userfield;
+      $contact[$contactfield] = isset($user->$userfield) ? $user->$userfield : '';
     }
   }
 
@@ -198,7 +198,7 @@
 
     // Make sure values are provided for each.
     if (!empty($manticorefield) && !empty($drupalfield)) {
-      $contact[$manticorefield] = $user->$drupalfield;
+      $contact[$manticorefield] = isset($user->$drupalfield) ? $user->$drupalfield : '';
     }
   }