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 ('ac8fb3e54cb5fb9e4740c5590ca4754e', -1, 1711700335, 1711700335, '12ce4c2d', -9, 0, 0)

Line : 187
File : sessions.php