diff --git a/phpBB/includes/mcp/mcp_warn.php b/phpBB/includes/mcp/mcp_warn.php
index 749b33163f..b2e54f9c30 100644
--- a/phpBB/includes/mcp/mcp_warn.php
+++ b/phpBB/includes/mcp/mcp_warn.php
@@ -603,8 +603,8 @@ function add_warning($user_row, $warning, $send_pm = true, $post_id = 0)
 	$db->sql_freeresult($result);
 
 	$phpbb_log->add('mod', $user->data['user_id'], $user->ip, 'LOG_USER_WARNING', false, array(
-		'forum_id' => $row['forum_id'],
-		'topic_id' => $row['topic_id'],
+		'forum_id' => $row['forum_id'] ?? 0,
+		'topic_id' => $row['topic_id'] ?? 0,
 		'post_id'  => $post_id,
 		$user_row['username']
 	));