array_key_exists_i() will now throw an exception if the key is not specified.

Author: Adambean

src/LdapSyncCommand.php

@@ -1528,7 +1528,9 @@ private function in_array_i($needle, array $haystack): bool
      */
     private function array_key_exists_i($key, array $haystack): bool
     {
-        $key = strtolower($key);
+        if (!$key = strtolower($key)) {
+            throw new \Exception("Key not specified.");
+        }
 
         foreach (array_change_key_case($haystack, CASE_LOWER) as $k => $v) {
             if ($k === $key) {