==== Error ====
* mwversion: `1.39.0-wmf.7`
* reqId: `986054a9-f97d-49a3-9005-02a8285c4f51`
* [[ https://logstash.wikimedia.org/app/dashboards#/view/AXFV7JE83bOlOASGccsT?_g=(time:(from:'2022-04-13T14:04:48.000Z',to:'2022-04-14T14:08:27.877Z'))&_a=(query:(query_string:(query:'reqId:%22986054a9-f97d-49a3-9005-02a8285c4f51%22'))) | Find reqId in Logstash ]]
```name=normalized_message
[{reqId}] {exception_url} TypeError: Argument 1 passed to DOMNode::appendChild() must be an instance of DOMNode, null given
```
```name=exception.trace,lines=10
from /srv/mediawiki/php-1.39.0-wmf.7/vendor/wikimedia/parsoid/src/Wt2Html/PP/Processors/AnnotationDOMRangeBuilder.php(111)
#0 /srv/mediawiki/php-1.39.0-wmf.7/vendor/wikimedia/parsoid/src/Wt2Html/PP/Processors/AnnotationDOMRangeBuilder.php(111): DOMNode->appendChild(NULL)
#1 /srv/mediawiki/php-1.39.0-wmf.7/vendor/wikimedia/parsoid/src/Wt2Html/PP/Processors/AnnotationDOMRangeBuilder.php(78): Wikimedia\Parsoid\Wt2Html\PP\Processors\AnnotationDOMRangeBuilder->makeUneditable(Wikimedia\Parsoid\Wt2Html\PP\Processors\DOMRangeInfo, integer, integer)
#2 /srv/mediawiki/php-1.39.0-wmf.7/vendor/wikimedia/parsoid/src/Wt2Html/PP/Processors/AnnotationDOMRangeBuilder.php(313): Wikimedia\Parsoid\Wt2Html\PP\Processors\AnnotationDOMRangeBuilder->wrapAnnotationsInTree(Wikimedia\Parsoid\DOM\Element)
#3 /srv/mediawiki/php-1.39.0-wmf.7/vendor/wikimedia/parsoid/src/Wt2Html/PP/Processors/WrapAnnotations.php(22): Wikimedia\Parsoid\Wt2Html\PP\Processors\AnnotationDOMRangeBuilder->execute(Wikimedia\Parsoid\DOM\Element)
#4 /srv/mediawiki/php-1.39.0-wmf.7/vendor/wikimedia/parsoid/src/Wt2Html/DOMPostProcessor.php(158): Wikimedia\Parsoid\Wt2Html\PP\Processors\WrapAnnotations->run(Wikimedia\Parsoid\Config\Env, Wikimedia\Parsoid\DOM\Element, array, boolean)
#5 /srv/mediawiki/php-1.39.0-wmf.7/vendor/wikimedia/parsoid/src/Wt2Html/DOMPostProcessor.php(848): Wikimedia\Parsoid\Wt2Html\DOMPostProcessor->Wikimedia\Parsoid\Wt2Html\{closure}(Wikimedia\Parsoid\DOM\Element, array, boolean)
#6 /srv/mediawiki/php-1.39.0-wmf.7/vendor/wikimedia/parsoid/src/Wt2Html/DOMPostProcessor.php(889): Wikimedia\Parsoid\Wt2Html\DOMPostProcessor->doPostProcess(Wikimedia\Parsoid\DOM\Element)
#7 /srv/mediawiki/php-1.39.0-wmf.7/vendor/wikimedia/parsoid/src/Wt2Html/DOMPostProcessor.php(907): Wikimedia\Parsoid\Wt2Html\DOMPostProcessor->process(Wikimedia\Parsoid\DOM\Element)
#8 /srv/mediawiki/php-1.39.0-wmf.7/vendor/wikimedia/parsoid/src/Wt2Html/ParserPipeline.php(180): Wikimedia\Parsoid\Wt2Html\DOMPostProcessor->processChunkily(string, array)
#9 /srv/mediawiki/php-1.39.0-wmf.7/vendor/wikimedia/parsoid/src/Wt2Html/ParserPipelineFactory.php(308): Wikimedia\Parsoid\Wt2Html\ParserPipeline->parseChunkily(string, array)
#10 /srv/mediawiki/php-1.39.0-wmf.7/vendor/wikimedia/parsoid/src/Wikitext/ContentModelHandler.php(123): Wikimedia\Parsoid\Wt2Html\ParserPipelineFactory->parse(string)
#11 /srv/mediawiki/php-1.39.0-wmf.7/vendor/wikimedia/parsoid/src/Parsoid.php(172): Wikimedia\Parsoid\Wikitext\ContentModelHandler->toDOM(Wikimedia\Parsoid\Ext\ParsoidExtensionAPI)
#12 /srv/mediawiki/php-1.39.0-wmf.7/vendor/wikimedia/parsoid/src/Parsoid.php(210): Wikimedia\Parsoid\Parsoid->parseWikitext(MediaWiki\Parser\Parsoid\Config\PageConfig, ParserOutput, array)
#13 /srv/mediawiki/php-1.39.0-wmf.7/vendor/wikimedia/parsoid/extension/src/Rest/Handler/ParsoidHandler.php(587): Wikimedia\Parsoid\Parsoid->wikitext2html(MediaWiki\Parser\Parsoid\Config\PageConfig, array, NULL, ParserOutput)
#14 /srv/mediawiki/php-1.39.0-wmf.7/vendor/wikimedia/parsoid/extension/src/Rest/Handler/PageHandler.php(88): MWParsoid\Rest\Handler\ParsoidHandler->wt2html(MediaWiki\Parser\Parsoid\Config\PageConfig, array)
#15 /srv/mediawiki/php-1.39.0-wmf.7/includes/Rest/Router.php(414): MWParsoid\Rest\Handler\PageHandler->execute()
#16 /srv/mediawiki/php-1.39.0-wmf.7/includes/Rest/Router.php(338): MediaWiki\Rest\Router->executeHandler(MWParsoid\Rest\Handler\PageHandler)
#17 /srv/mediawiki/php-1.39.0-wmf.7/includes/Rest/EntryPoint.php(166): MediaWiki\Rest\Router->execute(MediaWiki\Rest\RequestFromGlobals)
#18 /srv/mediawiki/php-1.39.0-wmf.7/includes/Rest/EntryPoint.php(131): MediaWiki\Rest\EntryPoint->execute()
#19 /srv/mediawiki/php-1.39.0-wmf.7/rest.php(31): MediaWiki\Rest\EntryPoint::main()
#20 /srv/mediawiki/w/rest.php(3): require(string)
#21 {main}
```
==== Notes ====
I saw a burst of 44 of these today. There are no other hits in the last 30 days.