diff --git a/min/lib/Minify/Controller/MinApp.php b/min/lib/Minify/Controller/MinApp.php
index 986ef2c..3522f8c 100644
--- a/min/lib/Minify/Controller/MinApp.php
+++ b/min/lib/Minify/Controller/MinApp.php
@@ -45,7 +45,8 @@ class Minify_Controller_MinApp extends Minify_Controller_Base {
                 $this->log("Duplicate group key found.");
                 return $options;
             }
-            foreach (explode(',', $_GET['g']) as $key) {
+            $keys = explode(',', $_GET['g']);
+            foreach ($keys as $key) {
                 if (! isset($cOptions['groups'][$key])) {
                     $this->log("A group configuration for \"{$key}\" was not found");
                     return $options;