Fatal error: Uncaught mysqli_sql_exception: Column 'categoria' in where clause is ambiguous in /home/c1900702/public_html/Clases/Conexion.php:28
Stack trace:
#0 /home/c1900702/public_html/Clases/Conexion.php(28): mysqli->query('SELECT `product...')
#1 /home/c1900702/public_html/Clases/Productos.php(283): Clases\Conexion->sqlReturn('SELECT `product...')
#2 /home/c1900702/public_html/producto.php(30): Clases\Productos->list(Array, 'RAND()', '8')
#3 {main}
  thrown in /home/c1900702/public_html/Clases/Conexion.php on line 28