Undefined index: title in link_field_diff_view()

This message comes up when "view changes" button is activated.

Notice: Undefined index: title in link_field_diff_view() (line 14 of /home/gas/public_html/profiles/varbase/modules/contrib/link/link.diff.inc).
Notice: Undefined index: title in link_field_diff_view() (line 18 of /home/gas/public_html/profiles/varbase/modules/contrib/link/link.diff.inc).

Thanks.