From 00849941c3ffad136176355403da2f45dc56e286 Mon Sep 17 00:00:00 2001
From: rxu <rxu@mail.ru>
Date: Tue, 29 Sep 2020 21:10:06 +0700
Subject: [PATCH] [ticket/16605] Fix possible SQL error on user registration

mysqli_insert_id() returns 0 if there was no previous query on the connection
or if the query did not update an AUTO_INCREMENT value for some reason.

PHPBB3-16605
---
 phpBB/includes/ucp/ucp_register.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/phpBB/includes/ucp/ucp_register.php b/phpBB/includes/ucp/ucp_register.php
index 6709123dfd..fa3b87d90a 100644
--- a/phpBB/includes/ucp/ucp_register.php
+++ b/phpBB/includes/ucp/ucp_register.php
@@ -424,7 +424,7 @@ class ucp_register
 				$user_id = user_add($user_row, $cp_data);
 
 				// This should not happen, because the required variables are listed above...
-				if ($user_id === false)
+				if ((bool) $user_id === false)
 				{
 					trigger_error('NO_USER', E_USER_ERROR);
 				}