javascript - How can I change the value that is connected to select change in dynamic form using jquery?

I was trying to make a form, which has two elements, one select item and one input price, select option are stored in database, so I retrieve it and display it.

User can add new row with same elements when button add is clicked, when the select option is changed, I am using ajax to get the price from database and displayed it in the text input.

It all worked fine with the first row but when user add new row I cannot retrieve the price and get the following message

"the specified value "NaN" is not a valid number. The value must match to the following regular expression: -?(\d+|\d+.\d+|.\d+)([eE][-+]?\d+)?"

How can I solve this problem or is there is another way to change the value of input using the row id

<table id="tab_logic">
  <tr id='row0'>
    <td>1</td>
    <td>
      <select name="item[]" required>
      <?php 
        $items = "SELECT itemCode, itemName FROM items";
        $itemslist = $conn->query($items);
        while($row = $itemslist->fetch_assoc()) {
          echo "<option value='" . $row["itemCode"] . "'>" . $row["itemName"]. "</option>" ;
        }
      ?>
      </select>
    </td>
    <td>
      <input type="text" name='price[]' required/>
    </td>
  </tr>
  <tr id='row1'></tr>
</table>
<button id="add_row" >Add Row</button>

<script>

function get_price(sel, item) 
{
  $.ajax({
    type: "POST",
    url : "getData.php",
    data: {itemCode: sel },
    success: function(data) {
      $(item).find("input").val(data.price) 
    },
  }); 
}

$(document).ready(function(){
  //add new row when add buttomn clicked 
  var i = 1;

  $("#add_row").click(function(){
    var a = i-1;

    $('#row' + i).html( $('#row' + a).html() )
          .find('td:first-child')
          .html(i+1);
    $('#tab_logic').append('<tr id="row' + (i+1) + '"></tr>');
    i++; 
  });

  //when selected item change get parent and call function 
  $('#tab_logic select').on('change', function() {
    var item = $(this).parent().parent();

    get_price(this.value, item);
  });

});

</script>
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