Index: mappers/number.inc
===================================================================
--- mappers/number.inc	(revision 34795)
+++ mappers/number.inc	(working copy)
@@ -49,7 +49,7 @@
   $info = field_info_field($target);
 
   // Iterate over all values.
-  $field = isset($entity->$target) ? $entity->$target : array('und' => array());
+  $field = array('und' => array());
 
   // Allow for multiple mappings to the same target.
   $delta = count($field['und']);