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Internal error

[ZgXWeNWuMKjc1YW1POZ7SAAAAAc] /index.php?title=Category:Flora&printable=yes TypeError from line 148 of /homepages/10/d330051118/htdocs/clickandbuilds/MediaWiki/thornswiki/extensions/PageSchemas/PageSchemas.classes.php: count(): Argument #1 ($value) must be of type Countable|array, null given

Backtrace:

#0 /homepages/10/d330051118/htdocs/clickandbuilds/MediaWiki/thornswiki/extensions/PageSchemas/PageSchemas.hooks.php(45): PageSchemas::displaySchema()
#1 /homepages/10/d330051118/htdocs/clickandbuilds/MediaWiki/thornswiki/includes/parser/Parser.php(3888): PageSchemasHooks::render()
#2 /homepages/10/d330051118/htdocs/clickandbuilds/MediaWiki/thornswiki/includes/parser/Preprocessor_DOM.php(1362): Parser->extensionSubstitution()
#3 /homepages/10/d330051118/htdocs/clickandbuilds/MediaWiki/thornswiki/includes/parser/Parser.php(2942): PPFrame_DOM->expand()
#4 /homepages/10/d330051118/htdocs/clickandbuilds/MediaWiki/thornswiki/includes/parser/Parser.php(1293): Parser->replaceVariables()
#5 /homepages/10/d330051118/htdocs/clickandbuilds/MediaWiki/thornswiki/includes/parser/Parser.php(443): Parser->internalParse()
#6 /homepages/10/d330051118/htdocs/clickandbuilds/MediaWiki/thornswiki/includes/content/WikitextContent.php(323): Parser->parse()
#7 /homepages/10/d330051118/htdocs/clickandbuilds/MediaWiki/thornswiki/includes/content/AbstractContent.php(516): WikitextContent->fillParserOutput()
#8 /homepages/10/d330051118/htdocs/clickandbuilds/MediaWiki/thornswiki/includes/poolcounter/PoolWorkArticleView.php(144): AbstractContent->getParserOutput()
#9 /homepages/10/d330051118/htdocs/clickandbuilds/MediaWiki/thornswiki/includes/poolcounter/PoolCounterWork.php(123): PoolWorkArticleView->doWork()
#10 /homepages/10/d330051118/htdocs/clickandbuilds/MediaWiki/thornswiki/includes/page/Article.php(604): PoolCounterWork->execute()
#11 /homepages/10/d330051118/htdocs/clickandbuilds/MediaWiki/thornswiki/includes/page/CategoryPage.php(69): Article->view()
#12 /homepages/10/d330051118/htdocs/clickandbuilds/MediaWiki/thornswiki/includes/actions/ViewAction.php(68): CategoryPage->view()
#13 /homepages/10/d330051118/htdocs/clickandbuilds/MediaWiki/thornswiki/includes/MediaWiki.php(500): ViewAction->show()
#14 /homepages/10/d330051118/htdocs/clickandbuilds/MediaWiki/thornswiki/includes/MediaWiki.php(294): MediaWiki->performAction()
#15 /homepages/10/d330051118/htdocs/clickandbuilds/MediaWiki/thornswiki/includes/MediaWiki.php(861): MediaWiki->performRequest()
#16 /homepages/10/d330051118/htdocs/clickandbuilds/MediaWiki/thornswiki/includes/MediaWiki.php(524): MediaWiki->main()
#17 /homepages/10/d330051118/htdocs/clickandbuilds/MediaWiki/thornswiki/index.php(42): MediaWiki->run()
#18 {main}