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 ('3492b7177ed6e916fd79ebf1b1b0b6d4', -1, 1708955551, 1708955551, '22ef9ac9', -8, 0, 0)

Line : 187
File : sessions.php