Getting a 500 Internal Server Error Jquery

While everything is running in the software, I get this error when I make a selection from the dropdown list in only one part. Where am I making a mistake? or is it a server error? I have not received this error in any Laravel before. When trying to get something from a dropdown list, this error comes to the console and there is no reaction on the site.

https://prnt.sc/vaujzf

<script type="text/javascript">
$("ul#product").siblings('a').attr('aria-expanded','true');
$("ul#product").addClass("show");
$("ul#product #adjustment-create-menu").addClass("active");
var lims_product_array = [];
var product_code = [];
var product_name = [];
var product_qty = [];

$('.selectpicker').selectpicker({
style: 'btn-link',
});

$('#lims_productcodeSearch').on('input', function(){
var warehouse_id = $('#warehouse_id').val();
temp_data = $('#lims_productcodeSearch').val();
if(!warehouse_id){
$('#lims_productcodeSearch').val(temp_data.substring(0, temp_data.length - 1));
alert('Please select Warehouse!');
}
});

$('select[name="warehouse_id"]').on('change', function() {
var id = $(this).val();
$.get('getproduct/' + id, function(data) {
lims_product_array = [];
product_code = data[0];
product_name = data[1];
product_qty = data[2];
$.each(product_code, function(index) {
lims_product_array.push(product_code[index] + ' (' + product_name[index] + ')');
});
});
});

var lims_productcodeSearch = $('#lims_productcodeSearch');

lims_productcodeSearch.autocomplete({
source: function(request, response) {
var matcher = new RegExp(".?" + $.ui.autocomplete.escapeRegex(request.term), "i");
response($.grep(lims_product_array, function(item) {
return matcher.test(item);
}));
},
response: function(event, ui) {
if (ui.content.length == 1) {
var data = ui.content[0].value;
$(this).autocomplete( "close" );
productSearch(data);
};
},
select: function(event, ui) {
var data = ui.item.value;
productSearch(data);
}
});

$("#myTable").on('input', '.qty', function() {
rowindex = $(this).closest('tr').index();
checkQuantity($(this).val(), true);
});

$("table.order-list tbody").on("click", ".ibtnDel", function(event) {
rowindex = $(this).closest('tr').index();
$(this).closest("tr").remove();
calculateTotal();
});

$(window).keydown(function(e){
if (e.which == 13) {
var $targ = $(e.target);
if (!$targ.is("textarea") && !$targ.is(":button,:submit")) {
var focusNext = false;
$(this).find(":input:visible:not([disabled],[readonly]), a").each(function(){
if (this === e.target) {
focusNext = true;
}
else if (focusNext){
$(this).focus();
return false;
}
});
return false;
}
}
});

$('#adjustment-form').on('submit',function(e){
var rownumber = $('table.order-list tbody tr:last').index();
if (rownumber < 0) {
alert("Please insert product to order table!")
e.preventDefault();
}
});

function productSearch(data){
$.ajax({
type: 'GET',
url: 'lims_product_search',
data: {
data: data
},
success: function(data) {
var flag = 1;
$(".product-code").each(function(i) {
if ($(this).val() == data[1]) {
rowindex = i;
var qty = parseFloat($('table.order-list tbody tr:nth-child(' + (rowindex + 1) + ') .qty').val()) + 1;
$('table.order-list tbody tr:nth-child(' + (rowindex + 1) + ') .qty').val(qty);
checkQuantity(qty);
flag = 0;
}
});
$("input[name='product_code_name']").val('');
if(flag){
var newRow = $("<tr>");
var cols = '';
cols += '<td>' + data[0] + '</td>';
cols += '<td>' + data[1] + '</td>';
cols += '<td><input type="number" class="form-control qty" name="qty[]" value="1" required step="any" /></td>';
cols += '<td class="action"><select name="action[]" class="form-control act-val"><option value="-"></option><option value="+"></option></select></td>';
cols += '<td><button type="button" class="ibtnDel btn btn-md btn-danger"></button></td>';
cols += '<input type="hidden" class="product-code" name="product_code[]" value="' + data[1] + '"/>';
cols += '<input type="hidden" class="product-id" name="product_id[]" value="' + data[2] + '"/>';

newRow.append(cols);
$("table.order-list tbody").append(newRow);
rowindex = newRow.index();
calculateTotal();
}
}
});
}

function checkQuantity(qty) {
var row_product_code = $('table.order-list tbody tr:nth-child(' + (rowindex + 1) + ')').find('td:nth-child(2)').text();
var action = $('table.order-list tbody tr:nth-child(' + (rowindex + 1) + ')').find('.act-val').val();
var pos = product_code.indexOf(row_product_code);

if ( (qty > parseFloat(product_qty[pos])) && (action == '-') ) {
alert('Quantity exceeds stock quantity!');
var row_qty = $('table.order-list tbody tr:nth-child(' + (rowindex + 1) + ')').find('.qty').val();
row_qty = row_qty.substring(0, row_qty.length - 1);
$('table.order-list tbody tr:nth-child(' + (rowindex + 1) + ')').find('.qty').val(row_qty);
}
else {
$('table.order-list tbody tr:nth-child(' + (rowindex + 1) + ')').find('.qty').val(qty);
}
calculateTotal();
}

function calculateTotal() {
var total_qty = 0;
$(".qty").each(function() {

if ($(this).val() == '') {
total_qty += 0;
} else {
total_qty += parseFloat($(this).val());
}
});
$("#total-qty").text(total_qty);
$('input[name="total_qty"]').val(total_qty);
$('input[name="item"]').val($('table.order-list tbody tr:last').index() + 1);
}
</script>

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