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-rw-r--r--phpBB/includes/functions.php2
1 files changed, 1 insertions, 1 deletions
diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index 864be41d8b..da698ae4cb 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -853,7 +853,7 @@ function markread($mode, $forum_id = false, $topic_id = false, $post_time = 0, $
$tracking['tf'][$forum_id][$topic_id36] = true;
}
- $tracking['t'][$topic_id36] = base_convert($post_time - $config['board_startdate'], 10, 36);
+ $tracking['t'][$topic_id36] = base_convert($post_time - (int) $config['board_startdate'], 10, 36);
// If the cookie grows larger than 10000 characters we will remove the smallest value
// This can result in old topics being unread - but most of the time it should be accurate...