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 ('cd895e8690552e4e6df4625b9ee69ce0', -1, 1711724670, 1711724670, '2cdf46a7', 6, 0, 0)

Line : 187
File : sessions.php