Uncaught TypeError: Cannot read property 'value' of null from virtuemart custom field - undefined

first of all, sorry for my bad English. I got some problem, and I need all of your help!!
I am trying to add custom fields in my product page, but when I select custom field from the list, it appears nothing in the screen and it adds up nothing to my product page. when I check the issue with chrome developer tools, it says
Uncaught TypeError: Cannot read property 'value' of null index.php:1917
Uncaught TypeError: Cannot read property'value' of null index.php:2180
(anonymous function) index.php:2180
e.resolveWith jquery.min.js:2
w jquery.min.js:4
d jquery.min.js:4.
at index.php
2179 function(data) {
2180 jQuery.each(data.value, function(index, value){
2181 jQuery("#custom_field").append(value);
2182 jQuery('#custom_field').trigger('sortupdate');
2183 });
});
Everything was working fine, before I tuned up my j-query easy plugins. I added one screenshot to my question. how can i solve this problem?
By the way, I am using Joomla! 2.5.9 and virtuemart 2.0.18a.
In advance Thanks for any help!!!
Asif

From the looks of this, it looks like data is undefined; wherever you pass data into the function, it's passing a null value into it. Check everywhere you call it; the problem will be found there.

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