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 ('9f8e7482d3ecc74475e03c290b41653b', -1, 1711627801, 1711627801, '22c91022', -8, 0, 0)

Line : 187
File : sessions.php