--- modules/user/views_handler_field_user_roles.inc	2012-02-15 09:48:34.000000000 +0000
+++ modules/user/views_handler_field_user_roles.inc.new	2012-02-15 09:48:38.000000000 +0000
@@ -43,7 +43,9 @@
   }
 
   function add_self_tokens(&$tokens, $item) {
-    $tokens['[' . $this->options['id'] . '-role' . ']'] = $item['role'];
-    $tokens['[' . $this->options['id'] . '-rid' . ']'] = $item['rid'];
+  	if (!empty($item['role'])) {
+    	$tokens['[' . $this->options['id'] . '-role' . ']'] = $item['role'];
+    	$tokens['[' . $this->options['id'] . '-rid' . ']'] = $item['rid'];
+    }
   }
 }