Last modified: 2007-11-02 12:20:02 UTC
Special:Browse of any page that doesn't exist on ontoworld.org indicates that it's in Category:Testpage.
http://ontoworld.org/wiki/Category:Testpage has an entry with strange punctuation ('n Beetje Verliefd) and another with asian characters (東京), but otherwise seems normal.
I can't reproduce on my own wiki. Most likely this is a glitch in ontoworld.org's DB tables such that page_id 0 got in the category table, so this query:
SQL: SELECT /* SMW::getSpecialValues 127.0.0.1 */ DISTINCT cl_to FROM `categorylinks` WHERE cl_from='0'
SMW_SpecialBrowse.php needs to perform queries for article titles that don't exist since they might be the object of properties and redirects. But I don't think it makes sense to query for article ID = 0. So an optimization *might* be for SMW_SQLStore to skip the queries when $subject->getArticleID() == 0. But then you'd never see this bug ;-)