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 ('79b6f5352919538cdef9e5fc150c7bef', -1, 1713621339, 1713621339, '0d3b52a7', -6, 0, 0)

Line : 187
File : sessions.php