==== Error ====
* mwversion: `1.37.0-wmf.17`
* reqId: `ad9ee4bd-4663-4f57-8a83-1aace42c57e2`
* [[ https://logstash.wikimedia.org/app/dashboards#/view/AXFV7JE83bOlOASGccsT?_g=(time:(from:'2021-08-10T17:05:10.000Z',to:'2021-08-11T18:17:39.814Z'))&_a=(query:(query_string:(query:'reqId:%22ad9ee4bd-4663-4f57-8a83-1aace42c57e2%22'))) | Find reqId in Logstash ]]
```name=normalized_message
[{reqId}] {exception_url} Wikimedia\Assert\InvariantException: Invariant failed: Expected an about id
```
```name=exception.trace,lines=10
from /srv/mediawiki/php-1.37.0-wmf.17/vendor/wikimedia/assert/src/Assert.php(224)
#0 /srv/mediawiki/php-1.37.0-wmf.17/vendor/wikimedia/parsoid/src/Wt2Html/PP/Processors/WrapSections.php(309): Wikimedia\Assert\Assert::invariant(boolean, string)
#1 /srv/mediawiki/php-1.37.0-wmf.17/vendor/wikimedia/parsoid/src/Wt2Html/PP/Processors/WrapSections.php(328): Wikimedia\Parsoid\Wt2Html\PP\Processors\WrapSections->getDSR(array, Wikimedia\Parsoid\DOM\Compat\Element, boolean)
#2 /srv/mediawiki/php-1.37.0-wmf.17/vendor/wikimedia/parsoid/src/Wt2Html/PP/Processors/WrapSections.php(328): Wikimedia\Parsoid\Wt2Html\PP\Processors\WrapSections->getDSR(array, Wikimedia\Parsoid\DOM\Compat\Element, boolean)
#3 /srv/mediawiki/php-1.37.0-wmf.17/vendor/wikimedia/parsoid/src/Wt2Html/PP/Processors/WrapSections.php(328): Wikimedia\Parsoid\Wt2Html\PP\Processors\WrapSections->getDSR(array, Wikimedia\Parsoid\DOM\Compat\Element, boolean)
#4 /srv/mediawiki/php-1.37.0-wmf.17/vendor/wikimedia/parsoid/src/Wt2Html/PP/Processors/WrapSections.php(538): Wikimedia\Parsoid\Wt2Html\PP\Processors\WrapSections->getDSR(array, Wikimedia\Parsoid\DOM\Compat\Element, boolean)
#5 /srv/mediawiki/php-1.37.0-wmf.17/vendor/wikimedia/parsoid/src/Wt2Html/PP/Processors/WrapSections.php(587): Wikimedia\Parsoid\Wt2Html\PP\Processors\WrapSections->resolveTplExtSectionConflicts(array)
#6 /srv/mediawiki/php-1.37.0-wmf.17/vendor/wikimedia/parsoid/src/Wt2Html/DOMPostProcessor.php(158): Wikimedia\Parsoid\Wt2Html\PP\Processors\WrapSections->run(Wikimedia\Parsoid\Config\Env, Wikimedia\Parsoid\DOM\Compat\Element, array, boolean)
#7 /srv/mediawiki/php-1.37.0-wmf.17/vendor/wikimedia/parsoid/src/Wt2Html/DOMPostProcessor.php(898): Wikimedia\Parsoid\Wt2Html\DOMPostProcessor->Wikimedia\Parsoid\Wt2Html\{closure}(Wikimedia\Parsoid\DOM\Compat\Element, array, boolean)
#8 /srv/mediawiki/php-1.37.0-wmf.17/vendor/wikimedia/parsoid/src/Wt2Html/DOMPostProcessor.php(948): Wikimedia\Parsoid\Wt2Html\DOMPostProcessor->doPostProcess(Wikimedia\Parsoid\DOM\Compat\Element)
#9 /srv/mediawiki/php-1.37.0-wmf.17/vendor/wikimedia/parsoid/src/Wt2Html/DOMPostProcessor.php(965): Wikimedia\Parsoid\Wt2Html\DOMPostProcessor->process(Wikimedia\Parsoid\DOM\Compat\Element)
#10 /srv/mediawiki/php-1.37.0-wmf.17/vendor/wikimedia/parsoid/src/Wt2Html/ParserPipeline.php(178): Wikimedia\Parsoid\Wt2Html\DOMPostProcessor->processChunkily(string, array)
#11 /srv/mediawiki/php-1.37.0-wmf.17/vendor/wikimedia/parsoid/src/Wt2Html/ParserPipelineFactory.php(307): Wikimedia\Parsoid\Wt2Html\ParserPipeline->parseChunkily(string, array)
#12 /srv/mediawiki/php-1.37.0-wmf.17/vendor/wikimedia/parsoid/src/Core/WikitextContentModelHandler.php(106): Wikimedia\Parsoid\Wt2Html\ParserPipelineFactory->parse(string)
#13 /srv/mediawiki/php-1.37.0-wmf.17/vendor/wikimedia/parsoid/src/Parsoid.php(166): Wikimedia\Parsoid\Core\WikitextContentModelHandler->toDOM(Wikimedia\Parsoid\Config\Env)
#14 /srv/mediawiki/php-1.37.0-wmf.17/vendor/wikimedia/parsoid/src/Parsoid.php(198): Wikimedia\Parsoid\Parsoid->parseWikitext(MWParsoid\Config\PageConfig, array)
#15 /srv/mediawiki/php-1.37.0-wmf.17/vendor/wikimedia/parsoid/extension/src/Rest/Handler/ParsoidHandler.php(588): Wikimedia\Parsoid\Parsoid->wikitext2html(MWParsoid\Config\PageConfig, array, NULL)
#16 /srv/mediawiki/php-1.37.0-wmf.17/vendor/wikimedia/parsoid/extension/src/Rest/Handler/PageHandler.php(88): MWParsoid\Rest\Handler\ParsoidHandler->wt2html(MWParsoid\Config\PageConfig, array)
#17 /srv/mediawiki/php-1.37.0-wmf.17/includes/Rest/Router.php(403): MWParsoid\Rest\Handler\PageHandler->execute()
#18 /srv/mediawiki/php-1.37.0-wmf.17/includes/Rest/Router.php(330): MediaWiki\Rest\Router->executeHandler(MWParsoid\Rest\Handler\PageHandler)
#19 /srv/mediawiki/php-1.37.0-wmf.17/includes/Rest/EntryPoint.php(165): MediaWiki\Rest\Router->execute(MediaWiki\Rest\RequestFromGlobals)
#20 /srv/mediawiki/php-1.37.0-wmf.17/includes/Rest/EntryPoint.php(130): MediaWiki\Rest\EntryPoint->execute()
#21 /srv/mediawiki/php-1.37.0-wmf.17/rest.php(31): MediaWiki\Rest\EntryPoint::main()
#22 /srv/mediawiki/w/rest.php(3): require(string)
#23 {main}
```
==== Impact ====
* Happened on both French and Central Kurdish Wikipedias, seems like the request is being tried a few times. Impact unclear
==== Notes ====