phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb2_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('d1902ea52681f801823a1ad97d1e8abb', -1, 1596752858, 1596752858, '03e40b09', 0, 0, 0)

Line : 187
File : sessions.php