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 ('73f2449eb665a84a9a9a6e55f7e1e5b0', -1, 1713448014, 1713448014, '12df6a64', 2, 0, 0)

Line : 187
File : sessions.php