Fatal error when return from browse in edit object

Solving the problem when there isn't node if the object has not yet been published.
The problem occurs when during the first edition is it return from browse for object relation.
PHP Fatal error:  Call to a member function urlAlias() on a non-object in /...../public_html/e
xtension/ezdisqus/datatypes/disquscomments/disquscommentstype.php on line 196, referer: http://....../admin/content/browse/123