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 ('d978c311349e99d1ab2644fc942090ca', -1, 1711649595, 1711649595, '2cc8a95b', -2, 0, 0)

Line : 187
File : sessions.php