phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO docttorrdiscluc_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('6ac927f9a18e5c929263e3d363022644', -1, 1545130956, 1545130956, '12d45dea', -7, 0, 0)

Line : 190
File : sessions.php