Found while investigating bug 10265 (and may actually be the cause of it, if the person's first view is cached):

Jun 15 14:14:00 srv147 httpd[30857]: PHP Fatal error: Call to undefined method Image::getNamespace() in /usr/local/apache/common-local/php-1.5/includes/ImageGallery.php on line 212

Version: 1.11.x
Severity: enhancement
URL: http://commons.wikimedia.org/w/index.php?title=Category:User-created_GFDL_images&until=Runway-operational.JPG