Thread:Extension talk:CirrusSearch/DOMDocument::loadHTML(): Empty string supplied

When I run php forceSearchIndex.php, this happens:

... Indexed 50 pages ending at 1523 at 11/second Warning: DOMDocument::loadHTML: Empty string supplied as input in /.../w/includes/HtmlFormatter.php on line 79 Indexed 50 pages ending at 1608 at 11/second ...

This is a bug? Should I worry about that?