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 ('7553c1e63746e53ab3551bf0d56ff10d', -1, 1714005942, 1714005942, '12e01e76', 2, 0, 0)

Line : 187
File : sessions.php