Cannot read property 'jQuery3110309118160008342142' of null

Question

Im appending disabled input fields using jquery and there is a button to remove that disabled property. it is working fine with static form but when i append disabled fields dynamically im getting below error on click of that input box or on change of that.

Uncaught TypeError: Cannot read property 'jQuery3110309118160008342142' of null
    at U.get (jquery.min.js:3)
    at U.access (jquery.min.js:3)
    at Function.data (jquery.min.js:3)
    at r.fn.init.i (jqueryvale14b?v=NOVQDySGO89wzMzO5x7mWS4C_uAdynpZe_Lk2y-xEM41:1)
    at HTMLUnknownElement.<anonymous> (jqueryvale14b?v=NOVQDySGO89wzMzO5x7mWS4C_uAdynpZe_Lk2y-xEM41:1)
    at HTMLUnknownElement.dispatch (jquery.min.js:3)
    at HTMLUnknownElement.q.handle (jquery.min.js:3)
    at Object.trigger (jquery.min.js:4)
    at Object.simulate (jquery.min.js:4)
    at HTMLDocument.c (jquery.min.js:4)

this is the code for removing disabled property

$(document).find("#"+formId).find(".custom-readonly-input").each(function(k, v){
 $(this).prop("disabled", false);
});

even i tried

$(this).removeAttr("disabled");

im getting same error Cannot read property JQuery_some random number_ of null

the form is dynamically appending and im doing validation also how to fix this

Here is the error Screenshot