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 ('fac7d2ec5cb1cfd62881bc0018ede997', -1, 1547892112, 1547892112, '22cbd574', 1, 0, 0)

Line : 190
File : sessions.php