Błąd wewnętrzny

PPFrame_DOM::expand: Invalid parameter type

Backtrace:

#0 /home/wiki/www/includes/parser/Parser.php(2861): PPFrame_DOM->expand(Object(PPNode_DOM), 0)
#1 /home/wiki/www/includes/parser/Parser.php(500): Parser->replaceVariables('$1 \xE2\x80\x93 {{SITENA...')
#2 /home/wiki/www/includes/parser/Parser.php(4381): Parser->preprocess('$1 \xE2\x80\x93 {{SITENA...', Object(Title), Object(ParserOptions))
#3 /home/wiki/www/includes/cache/MessageCache.php(788): Parser->transformMsg('$1 \xE2\x80\x93 {{SITENA...', Object(ParserOptions), NULL)
#4 /home/wiki/www/includes/GlobalFunctions.php(1187): MessageCache->transform('$1 \xE2\x80\x93 {{SITENA...')
#5 /home/wiki/www/includes/GlobalFunctions.php(1163): wfMsgGetKey('pagetitle', true, false, true)
#6 /home/wiki/www/includes/GlobalFunctions.php(1081): wfMsgReal('pagetitle', Array)
#7 /home/wiki/www/includes/OutputPage.php(773): wfMsg('pagetitle', 'Ostatnie zmiany')
#8 /home/wiki/www/includes/SpecialPage.php(531): OutputPage->setPageTitle('Ostatnie zmiany')
#9 /home/wiki/www/includes/specials/SpecialRecentchanges.php(141): SpecialPage->setHeaders()
#10 /home/wiki/www/includes/SpecialPageFactory.php(458): SpecialRecentChanges->execute(NULL)
#11 /home/wiki/www/includes/Wiki.php(240): SpecialPageFactory::executePath(Object(Title), Object(RequestContext))
#12 /home/wiki/www/includes/Wiki.php(640): MediaWiki->performRequest()
#13 /home/wiki/www/includes/Wiki.php(547): MediaWiki->main()
#14 /home/wiki/www/index.php(57): MediaWiki->run()
#15 {main}