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 ('328a96f5f35a5fc4e641643f9f3096dc', -1, 1711651840, 1711651840, '2cc8e62b', 6, 0, 0)

Line : 187
File : sessions.php