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 ('4723a10d13c9c6ac8759ef278a28859b', -1, 1574411791, 1574411791, '12cc3868', -6, 0, 0)

Line : 190
File : sessions.php