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 ('451df55f358c2a40a68267b9db604eeb', -1, 1542177611, 1542177611, '36dd4b73', -1, 0, 0)

Line : 190
File : sessions.php