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 ('6117bc2c9b5b9fe20b3179f018a38eb0', -1, 1711647760, 1711647760, '2cc8e62b', -4, 0, 0)

Line : 187
File : sessions.php