Fatal error: Uncaught mysqli_sql_exception: Duplicate entry '11' for key 'PRIMARY' in /users/2020/i2019031/public_html/WebDB/06/insert.php:16 Stack trace: #0 /users/2020/i2019031/public_html/WebDB/06/insert.php(16): mysqli_query() #1 {main} thrown in /users/2020/i2019031/public_html/WebDB/06/insert.php on line 16