-my $url_html = $url =~ s/(?:[.]$lang)?[.]txt$/.html/r;
-$url_html =~ s|/bandali-(.*)|/$1|;
-my $slug = $url_html =~ s|.*/(.*)[.]html$|$1|r;
-my $note_id = "$feed_id:$slug";
+my $url_html = $url =~ s/(?:[.]$lang)?[.]txt$/.html/r if $url;
+$url_html =~ s|/bandali-(.*)|/$1| if $url_html;
+my $slug = $url_html =~ s|.*/(.*)[.]html$|$1|r if $url_html;
+my $note_id = "$feed_id:$slug" if $url_html;