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 ('db8755958a6589a9d3c99bccc1df6712', -1, 1711700288, 1711700288, '36e25ed9', -2, 0, 0)

Line : 187
File : sessions.php