@foreach ($urls as $url)
<url>
<loc>{{ url($url->path) }}</loc>
- <lastmod>{{ $url->lastmod->tz('UTC')->toAtomString() }}</lastmod>
+ @if ($url->lastmod)
+ <lastmod>{{ $url->lastmod->tz('UTC')->toAtomString() }}</lastmod>
+ @endif
<changefreq>{{ $url->changefreq }}</changefreq>
<priority>{{ $url->priority }}</priority>
</url>