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 ('3cf681f89f52d9f6aed9f6cd2e485796', -1, 1711704688, 1711704688, '2cc8ae9d', -4, 0, 0)

Line : 187
File : sessions.php