Internal error

RepoGroup::findFile recieved an Title object with incorrect namespace

Backtrace:

#0 /home/larsent/WWW/knowino.org/public/w/includes/GlobalFunctions.php(3181): RepoGroup->findFile(Object(Title), Array)
#1 /home/larsent/WWW/knowino.org/public/w/includes/specials/SpecialFileDuplicateSearch.php(117): wfFindFile(Object(Title))
#2 [internal function]: wfSpecialFileDuplicateSearch('Gamma_function....', Object(SpecialPage))
#3 /home/larsent/WWW/knowino.org/public/w/includes/SpecialPage.php(853): call_user_func('wfSpecialFileDu...', 'Gamma_function....', Object(SpecialPage))
#4 /home/larsent/WWW/knowino.org/public/w/includes/SpecialPage.php(580): SpecialPage->execute('Gamma_function....')
#5 /home/larsent/WWW/knowino.org/public/w/includes/Wiki.php(245): SpecialPage::executePath(Object(Title))
#6 /home/larsent/WWW/knowino.org/public/w/includes/Wiki.php(63): MediaWiki->handleSpecialCases(Object(Title), Object(OutputPage), Object(WebRequest))
#7 /home/larsent/WWW/knowino.org/public/w/index.php(103): MediaWiki->performRequestForTitle(Object(Title), NULL, Object(OutputPage), Object(User), Object(WebRequest))
#8 {main}