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 ('9efbc28a29db3575bf2c99ac1c649d08', -1, 1591353224, 1591353224, '12cce375', -19, 0, 0)

Line : 172
File : sessions.php