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 ('050378dda2abf9e275c8e8b4e27a1ed9', -1, 1542439434, 1542439434, '3692c318', -1, 0, 0)

Line : 190
File : sessions.php