Error Cannot read property 'val' of null

Greetings to all! In the html document there is an input field, into which I try to transfer the name value, I get the error Cannot read property 'val' of null

I will be glad to any help.

jQuery("a#source-link").on("click", function(event) { event.preventDefault(); var link_title = jQuery(this).attr("name"); $("input#target-textfield").val(link_title); });