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 ('1a9482f31621778ad33e08da5ac9b7b2', -1, 1713947758, 1713947758, '0387d5d6', 2, 0, 0)

Line : 187
File : sessions.php