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 ('e615f72761906f476ff6e34a9169e5e6', -1, 1603844800, 1603844800, '22eacf64', 91, 0, 0)

Line : 172
File : sessions.php