diff --git a/src/opnsense/mvc/app/library/OPNsense/Core/Config.php b/src/opnsense/mvc/app/library/OPNsense/Core/Config.php
index 1e9903865..2accec957 100644
--- a/src/opnsense/mvc/app/library/OPNsense/Core/Config.php
+++ b/src/opnsense/mvc/app/library/OPNsense/Core/Config.php
@@ -75,12 +75,12 @@ class Config extends Singleton
      */
     private function isArraySequential(&$arrayData)
     {
+        $all_keys = array_keys($arrayData);
+        $last_key = count($all_keys);
+        // probably a safe bet, first key equals 0, last equals the number of keys minus 1.
         if (empty($arrayData)) {
             return true;
         } elseif ($all_keys[0] == "0" && $all_keys[$last_key-1] == ($last_key-1)) {
-            $all_keys = array_keys($arrayData);
-            $last_key = count($all_keys);
-            // probably a safe bet, first key equals 0, last equals the number of keys minus 1.
             return true;
         }