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 ('d5fb35b0216600e2c642a52bf4cf4f56', -1, 1542435549, 1542435549, '3692c318', -4, 0, 0)

Line : 190
File : sessions.php