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 ('a6e2bd0966717ebd7fd03d46eb9b7125', -1, 1711720350, 1711720350, '22ed4ba5', 6, 0, 0)

Line : 187
File : sessions.php