Index: handlers/apachesolr_views_handler_argument_optionwidget.inc
===================================================================
--- handlers/apachesolr_views_handler_argument_optionwidget.inc	(revision 1665)
+++ handlers/apachesolr_views_handler_argument_optionwidget.inc	(working copy)
@@ -28,9 +28,8 @@
     // time to set the arguments to something new
     $new_arguments = array();
     foreach ($arguments as $value) {
-      $key = array_search($value, $options);
-      if (!empty($key)) {
-        $new_arguments[] = $key;
+      if (array_key_exists($value, $options)) {
+        $new_arguments[] = $value;
       }
       else {
         // TODO: do we need to do something here?