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 ('959677f0f0b1a1543ad5e8fb47a4b3c6', -1, 1714006374, 1714006374, '0390711e', -10, 0, 0)

Line : 187
File : sessions.php