diff --git a/inc/functions.php b/inc/functions.php
index eecf7eb1..45f81702 100644
--- a/inc/functions.php
+++ b/inc/functions.php
@@ -356,8 +356,12 @@ function define_groups() {
 
 function create_antibot($board, $thread = null) {
 	require_once dirname(__FILE__) . '/anti-bot.php';
+	global $pdo;
 
-	return _create_antibot($board, $thread);
+	// Ensure $pdo is initialized.
+	sql_open();
+
+	return _create_antibot($pdo, $board, $thread);
 }
 
 function rebuildThemes($action, $boardname = false) {