diff --git a/src/cli/document/search.php b/src/cli/document/search.php
index be02393..3a9183e 100644
--- a/src/cli/document/search.php
+++ b/src/cli/document/search.php
@@ -11,7 +11,7 @@ $config = json_decode(
 );
 
 // Validate request
-if (empty($argv[1]))
+if (!isset($argv[1]))
 {
   exit(
     _('search query required as the first argument!') . PHP_EOL