[{reqId}] {exception_url}   PHP Notice: Trying to get property 'identifiers' of non-object

from /srv/mediawiki/php-1.42.0-wmf.2/extensions/Math/src/MathRestbaseInterface.php(378)
#0 /srv/mediawiki/php-1.42.0-wmf.2/extensions/Math/src/MathRestbaseInterface.php(378): MWExceptionHandler::handleError(integer, string, string, integer, array)
#1 /srv/mediawiki/php-1.42.0-wmf.2/extensions/Math/src/MathRestbaseInterface.php(140): MediaWiki\Extension\Math\MathRestbaseInterface->evaluateRestbaseCheckResponse(array)
#2 /srv/mediawiki/php-1.42.0-wmf.2/extensions/Math/src/MathRestbaseInterface.php(309): MediaWiki\Extension\Math\MathRestbaseInterface->checkTeX()
#3 /srv/mediawiki/php-1.42.0-wmf.2/extensions/Math/src/InputCheck/RestbaseChecker.php(40): MediaWiki\Extension\Math\MathRestbaseInterface->getSuccess()
#4 /srv/mediawiki/php-1.42.0-wmf.2/extensions/Math/src/MathRenderer.php(692): MediaWiki\Extension\Math\InputCheck\RestbaseChecker->isValid()
#5 /srv/mediawiki/php-1.42.0-wmf.2/extensions/Math/src/MathRenderer.php(603): MediaWiki\Extension\Math\MathRenderer->doCheck()
#6 /srv/mediawiki/php-1.42.0-wmf.2/extensions/Math/src/MathRenderer.php(378): MediaWiki\Extension\Math\MathRenderer->checkTeX()
#7 /srv/mediawiki/php-1.42.0-wmf.2/extensions/Math/src/MathMathML.php(82): MediaWiki\Extension\Math\MathRenderer->addTrackingCategories(Parser)
#8 /srv/mediawiki/php-1.42.0-wmf.2/extensions/Math/src/HookHandlers/ParserHooksHandler.php(121): MediaWiki\Extension\Math\MathMathML->addTrackingCategories(Parser)
#9 /srv/mediawiki/php-1.42.0-wmf.2/extensions/Math/src/HookHandlers/ParserHooksHandler.php(161): MediaWiki\Extension\Math\HookHandlers\ParserHooksHandler->mathPostTagHook(MediaWiki\Extension\Math\MathMathML, Parser)
#10 /srv/mediawiki/php-1.42.0-wmf.2/includes/HookContainer/HookContainer.php(161): MediaWiki\Extension\Math\HookHandlers\ParserHooksHandler->onParserAfterTidy(Parser, string)
#11 /srv/mediawiki/php-1.42.0-wmf.2/includes/HookContainer/HookRunner.php(2903): MediaWiki\HookContainer\HookContainer->run(string, array)
#12 /srv/mediawiki/php-1.42.0-wmf.2/includes/parser/Parser.php(1690): MediaWiki\HookContainer\HookRunner->onParserAfterTidy(Parser, string)
#13 /srv/mediawiki/php-1.42.0-wmf.2/includes/parser/Parser.php(859): Parser->internalParseHalfParsed(string, boolean)
#14 /srv/mediawiki/php-1.42.0-wmf.2/includes/parser/Parsoid/Config/DataAccess.php(348): Parser->parseExtensionTagAsTopLevelDoc(string)
#15 /srv/mediawiki/php-1.42.0-wmf.2/vendor/wikimedia/parsoid/src/Wt2Html/TT/ExtensionHandler.php(152): MediaWiki\Parser\Parsoid\Config\DataAccess->parseWikitext(MediaWiki\Parser\Parsoid\Config\PageConfig, ParserOutput, string)
#16 /srv/mediawiki/php-1.42.0-wmf.2/vendor/wikimedia/parsoid/src/Wt2Html/TT/ExtensionHandler.php(282): Wikimedia\Parsoid\Wt2Html\TT\ExtensionHandler->onExtension(Wikimedia\Parsoid\Tokens\SelfclosingTagTk)
#17 /srv/mediawiki/php-1.42.0-wmf.2/vendor/wikimedia/parsoid/src/Wt2Html/TT/TokenHandler.php(150): Wikimedia\Parsoid\Wt2Html\TT\ExtensionHandler->onTag(Wikimedia\Parsoid\Tokens\SelfclosingTagTk)
#18 /srv/mediawiki/php-1.42.0-wmf.2/vendor/wikimedia/parsoid/src/Wt2Html/TokenTransformManager.php(132): Wikimedia\Parsoid\Wt2Html\TT\TokenHandler->process(array)
#19 /srv/mediawiki/php-1.42.0-wmf.2/vendor/wikimedia/parsoid/src/Wt2Html/TokenTransformManager.php(195): Wikimedia\Parsoid\Wt2Html\TokenTransformManager->processChunk(array)
#20 /srv/mediawiki/php-1.42.0-wmf.2/vendor/wikimedia/parsoid/src/Wt2Html/TokenTransformManager.php(193): Wikimedia\Parsoid\Wt2Html\TokenTransformManager->processChunkily(string, array)
#21 /srv/mediawiki/php-1.42.0-wmf.2/vendor/wikimedia/parsoid/src/Wt2Html/TreeBuilder/TreeBuilderStage.php(490): Wikimedia\Parsoid\Wt2Html\TokenTransformManager->processChunkily(string, array)
#22 [internal function]: Wikimedia\Parsoid\Wt2Html\TreeBuilder\TreeBuilderStage->processChunkily(string, array)
#23 /srv/mediawiki/php-1.42.0-wmf.2/vendor/wikimedia/parsoid/src/Wt2Html/DOMPostProcessor.php(994): Generator->current()
#24 /srv/mediawiki/php-1.42.0-wmf.2/vendor/wikimedia/parsoid/src/Wt2Html/ParserPipeline.php(180): Wikimedia\Parsoid\Wt2Html\DOMPostProcessor->processChunkily(string, array)
#25 /srv/mediawiki/php-1.42.0-wmf.2/vendor/wikimedia/parsoid/src/Wt2Html/ParserPipelineFactory.php(299): Wikimedia\Parsoid\Wt2Html\ParserPipeline->parseChunkily(string, array)
#26 /srv/mediawiki/php-1.42.0-wmf.2/vendor/wikimedia/parsoid/src/Wikitext/ContentModelHandler.php(164): Wikimedia\Parsoid\Wt2Html\ParserPipelineFactory->parse(string)
#27 /srv/mediawiki/php-1.42.0-wmf.2/vendor/wikimedia/parsoid/src/Parsoid.php(199): Wikimedia\Parsoid\Wikitext\ContentModelHandler->toDOM(Wikimedia\Parsoid\Ext\ParsoidExtensionAPI)
#28 /srv/mediawiki/php-1.42.0-wmf.2/vendor/wikimedia/parsoid/src/Parsoid.php(240): Wikimedia\Parsoid\Parsoid->parseWikitext(MediaWiki\Parser\Parsoid\Config\PageConfig, ParserOutput, array)
#29 /srv/mediawiki/php-1.42.0-wmf.2/includes/parser/Parsoid/ParsoidParser.php(143): Wikimedia\Parsoid\Parsoid->wikitext2html(MediaWiki\Parser\Parsoid\Config\PageConfig, array, NULL, ParserOutput)
#30 /srv/mediawiki/php-1.42.0-wmf.2/includes/parser/Parsoid/ParsoidParser.php(240): MediaWiki\Parser\Parsoid\ParsoidParser->genParserOutput(MediaWiki\Parser\Parsoid\Config\PageConfig, ParserOptions)
#31 /srv/mediawiki/php-1.42.0-wmf.2/includes/content/WikitextContentHandler.php(420): MediaWiki\Parser\Parsoid\ParsoidParser->parse(string, MediaWiki\Title\Title, ParserOptions, boolean, boolean, integer)
#32 /srv/mediawiki/php-1.42.0-wmf.2/includes/content/ContentHandler.php(1760): WikitextContentHandler->fillParserOutput(WikitextContent, MediaWiki\Content\Renderer\ContentParseParams, ParserOutput)
#33 /srv/mediawiki/php-1.42.0-wmf.2/includes/content/Renderer/ContentRenderer.php(47): ContentHandler->getParserOutput(WikitextContent, MediaWiki\Content\Renderer\ContentParseParams)
#34 /srv/mediawiki/php-1.42.0-wmf.2/includes/Revision/RenderedRevision.php(260): MediaWiki\Content\Renderer\ContentRenderer->getParserOutput(WikitextContent, MediaWiki\Title\Title, integer, ParserOptions, boolean)
#35 /srv/mediawiki/php-1.42.0-wmf.2/includes/Revision/RenderedRevision.php(232): MediaWiki\Revision\RenderedRevision->getSlotParserOutputUncached(WikitextContent, boolean)
#36 /srv/mediawiki/php-1.42.0-wmf.2/includes/Revision/RevisionRenderer.php(223): MediaWiki\Revision\RenderedRevision->getSlotParserOutput(string, array)
#37 /srv/mediawiki/php-1.42.0-wmf.2/includes/Revision/RevisionRenderer.php(164): MediaWiki\Revision\RevisionRenderer->combineSlotOutput(MediaWiki\Revision\RenderedRevision, array)
#38 [internal function]: MediaWiki\Revision\RevisionRenderer->MediaWiki\Revision\{closure}(MediaWiki\Revision\RenderedRevision, array)
#39 /srv/mediawiki/php-1.42.0-wmf.2/includes/Revision/RenderedRevision.php(199): call_user_func(Closure, MediaWiki\Revision\RenderedRevision, array)
#40 /srv/mediawiki/php-1.42.0-wmf.2/includes/poolcounter/PoolWorkArticleView.php(84): MediaWiki\Revision\RenderedRevision->getRevisionParserOutput()
#41 /srv/mediawiki/php-1.42.0-wmf.2/includes/poolcounter/PoolWorkArticleViewOld.php(66): PoolWorkArticleView->renderRevision()
#42 /srv/mediawiki/php-1.42.0-wmf.2/includes/poolcounter/PoolCounterWork.php(167): PoolWorkArticleViewOld->doWork()
#43 /srv/mediawiki/php-1.42.0-wmf.2/includes/page/ParserOutputAccess.php(325): PoolCounterWork->execute()
#44 /srv/mediawiki/php-1.42.0-wmf.2/includes/parser/Parsoid/ParsoidOutputAccess.php(197): MediaWiki\Page\ParserOutputAccess->getParserOutput(MediaWiki\Page\PageStoreRecord, ParserOptions, MediaWiki\Revision\RevisionStoreRecord, integer)
#45 /srv/mediawiki/php-1.42.0-wmf.2/includes/Rest/Handler/Helper/HtmlOutputRendererHelper.php(761): MediaWiki\Parser\Parsoid\ParsoidOutputAccess->getParserOutput(MediaWiki\Page\PageStoreRecord, ParserOptions, MediaWiki\Revision\RevisionStoreRecord, integer, boolean)
#46 /srv/mediawiki/php-1.42.0-wmf.2/includes/Rest/Handler/Helper/HtmlOutputRendererHelper.php(569): MediaWiki\Rest\Handler\Helper\HtmlOutputRendererHelper->getParserOutputInternal(ParserOptions)
#47 /srv/mediawiki/php-1.42.0-wmf.2/includes/Rest/Handler/Helper/HtmlOutputRendererHelper.php(665): MediaWiki\Rest\Handler\Helper\HtmlOutputRendererHelper->getParserOutput()
#48 /srv/mediawiki/php-1.42.0-wmf.2/includes/Rest/Handler/ParsoidHandler.php(875): MediaWiki\Rest\Handler\Helper\HtmlOutputRendererHelper->getPageBundle()
#49 /srv/mediawiki/php-1.42.0-wmf.2/vendor/wikimedia/parsoid/extension/src/Rest/Handler/PageHandler.php(92): MediaWiki\Rest\Handler\ParsoidHandler->wt2html(MediaWiki\Parser\Parsoid\Config\PageConfig, array)
#50 /srv/mediawiki/php-1.42.0-wmf.2/includes/Rest/Router.php(536): MWParsoid\Rest\Handler\PageHandler->execute()
#51 /srv/mediawiki/php-1.42.0-wmf.2/includes/Rest/Router.php(441): MediaWiki\Rest\Router->executeHandler(MWParsoid\Rest\Handler\PageHandler)
#52 /srv/mediawiki/php-1.42.0-wmf.2/includes/Rest/EntryPoint.php(195): MediaWiki\Rest\Router->execute(MediaWiki\Rest\RequestFromGlobals)
#53 /srv/mediawiki/php-1.42.0-wmf.2/includes/Rest/EntryPoint.php(135): MediaWiki\Rest\EntryPoint->execute()
#54 /srv/mediawiki/php-1.42.0-wmf.2/rest.php(31): MediaWiki\Rest\EntryPoint::main()
#55 /srv/mediawiki/w/rest.php(3): require(string)
#56 {main}