phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('88d435fec8a76e960d732f6d13f68e27', -1, 1713440367, 1713440367, '12ddebd1', 6, 0, 0)

Line : 187
File : sessions.php