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 ('1d9bc80f7b5de3e832f503dacb5cbe06', -1, 1711663897, 1711663897, '12cea081', -9, 0, 0)

Line : 187
File : sessions.php