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 ('5b4c54a52df7ad594cc81452e713e6d5', -1, 1711664790, 1711664790, '2cdf1f94', 2, 0, 0)

Line : 187
File : sessions.php