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 ('6c62c862814f2f71d56b0bee42ffda6f', -1, 1582956685, 1582956685, '03e3fcbf', 18, 0, 0)

Line : 191
File : sessions.php