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 ('6ed4c4b380bdf6e2b51b12863245f7d3', -1, 1713852842, 1713852842, '031196a3', 2, 0, 0)

Line : 187
File : sessions.php