<br /> tags are getting removed while pasting in nicedit textarea

Question

I am calling an instance of nicedit:

var st = new nicEditor({
  maxHeight: 220,
  texteditor: <%=raw @editor_trs.to_json%>
}).panelInstance('template_body');

Once this is done, I am doing copy paste of some string having <br /> tags. But while pasting these tags are removed.

Need help on preventing the tags while copy paste.