JSON.parse: unexpected character

When we create any bug, we got an Javascript error:
JSON.parse: unexpected character

After some investigation, we realised, that problem was in jira-dnd-attachment.js file on line 253:

            AJS.$.get(contextPath + "/rest/jira-dnd-attachment/1.0/issue/attachments/limits", function(data)
            {
                var limits = JSON.parse(data);  // Error is here
                if (limits !== "undefined" && limits.maxSize !== "undefined")
                {
                    dndAttachment.attachmentSizeLimit = parseInt(limits.maxSize);
                }
            });

When we replaced that string to var limits = data; error gone.
I suppose, that JQuery's get method by default uses Intelligent Guess, and automagically converts data to json. So additional convert is not possible.
Hope, you can fix it quickly.