Internal error
[aa90b9fc7207378b0701dffc] /mw/index.php?title=Issuepedia:User_Guide&oldid=28607&diff=prev TypeError from line 171 of /home/issuepedia/site/git/w3tpl/tags/let.php: Return value of w3tpl\xcTag_let::GetTagInput() must be of the type string, null returned
Backtrace:
#0 /home/issuepedia/site/git/w3tpl/tags/let.php(57): w3tpl\xcTag_let->GetTagInput()
#1 /home/issuepedia/site/git/w3tpl/classes/tags.php(105): w3tpl\xcTag_let->Go()
#2 /home/issuepedia/site/git/w3tpl/classes/tags.php(53): w3tpl\xcTag->FigureReturnValue()
#3 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/parser/Parser.php(3922): w3tpl\xcTag::Call()
#4 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/parser/PPFrame_Hash.php(330): Parser->extensionSubstitution()
#5 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/parser/Parser.php(2887): PPFrame_Hash->expand()
#6 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/parser/Parser.php(1556): Parser->replaceVariables()
#7 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/parser/Parser.php(850): Parser->internalParse()
#8 /home/issuepedia/site/git/w3tpl/tags/hide.php(12): Parser->recursiveTagParse()
#9 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/parser/Parser.php(3922): w3tpl\xcTag_hide::Call()
#10 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/parser/PPFrame_Hash.php(330): Parser->extensionSubstitution()
#11 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/parser/Parser.php(2887): PPFrame_Hash->expand()
#12 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/parser/Parser.php(1556): Parser->replaceVariables()
#13 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/parser/Parser.php(651): Parser->internalParse()
#14 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/content/WikitextContent.php(374): Parser->parse()
#15 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/content/AbstractContent.php(590): WikitextContent->fillParserOutput()
#16 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/Revision/RenderedRevision.php(263): AbstractContent->getParserOutput()
#17 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/Revision/RenderedRevision.php(235): MediaWiki\Revision\RenderedRevision->getSlotParserOutputUncached()
#18 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/Revision/RevisionRenderer.php(215): MediaWiki\Revision\RenderedRevision->getSlotParserOutput()
#19 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/Revision/RevisionRenderer.php(152): MediaWiki\Revision\RevisionRenderer->combineSlotOutput()
#20 [internal function]: MediaWiki\Revision\RevisionRenderer->MediaWiki\Revision\{closure}()
#21 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/Revision/RenderedRevision.php(197): call_user_func()
#22 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/poolcounter/PoolWorkArticleView.php(216): MediaWiki\Revision\RenderedRevision->getRevisionParserOutput()
#23 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/poolcounter/PoolCounterWork.php(162): PoolWorkArticleView->doWork()
#24 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/page/WikiPage.php(1281): PoolCounterWork->execute()
#25 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/diff/DifferenceEngine.php(1093): WikiPage->getParserOutput()
#26 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/diff/DifferenceEngine.php(1050): DifferenceEngine->getParserOutput()
#27 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/diff/DifferenceEngine.php(878): DifferenceEngine->renderNewRevision()
#28 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/page/Article.php(980): DifferenceEngine->showDiffPage()
#29 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/page/Article.php(656): Article->showDiffPage()
#30 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/actions/ViewAction.php(74): Article->view()
#31 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/MediaWiki.php(527): ViewAction->show()
#32 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/MediaWiki.php(313): MediaWiki->performAction()
#33 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/MediaWiki.php(940): MediaWiki->performRequest()
#34 /home/issuepedia/site/mw/mediawiki-1.35.0/includes/MediaWiki.php(543): MediaWiki->main()
#35 /home/issuepedia/site/mw/mediawiki-1.35.0/index.php(53): MediaWiki->run()
#36 /home/issuepedia/site/mw/mediawiki-1.35.0/index.php(46): wfIndexMain()
#37 {main}