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 ('a35ecdacb2eb8d5b6bf8134d3308cc0d', -1, 1542181619, 1542181619, '36dd4b73', -4, 0, 0)

Line : 190
File : sessions.php