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 ('4896add0dbb681e24fc8afc0b2d1a8d0', -1, 1711666191, 1711666191, '2ccd0541', -7, 0, 0)

Line : 187
File : sessions.php