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 ('5f58080c9f97f245015c669907d5bcd0', -1, 1711701048, 1711701048, '2cc7e1dd', -2, 0, 0)

Line : 187
File : sessions.php