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 ('9125ee24f9fc2519c7ed5543c4ac8b7a', -1, 1582889382, 1582889382, '03e9d95b', 18, 0, 0)

Line : 191
File : sessions.php