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 ('a32a1dce567c594d803802b8d4994054', -1, 1542180813, 1542180813, '36dd4b73', -4, 0, 0)

Line : 190
File : sessions.php