Internal error

[62b81d478582639dec9e06a4] /wiki/Category:Buildings_and_structures_in_Pushkin ValueError: DOMDocument::loadHTML(): Argument #1 ($source) must not be empty

Backtrace:

from /var/www/justapedia.org/LocalSettings.php(950)
#0 /var/www/justapedia.org/LocalSettings.php(950): DOMDocument->loadHTML()
#1 /var/www/justapedia.org/includes/HookContainer/HookContainer.php(338): {closure}()
#2 /var/www/justapedia.org/includes/HookContainer/HookContainer.php(137): MediaWiki\HookContainer\HookContainer->callLegacyHook()
#3 /var/www/justapedia.org/includes/HookContainer/HookRunner.php(2679): MediaWiki\HookContainer\HookContainer->run()
#4 /var/www/justapedia.org/includes/OutputPage.php(2200): MediaWiki\HookContainer\HookRunner->onOutputPageParserOutput()
#5 /var/www/justapedia.org/includes/OutputPage.php(2267): OutputPage->addParserOutputMetadata()
#6 /var/www/justapedia.org/includes/page/Article.php(864): OutputPage->addParserOutput()
#7 /var/www/justapedia.org/includes/page/Article.php(769): Article->doOutputFromRenderStatus()
#8 /var/www/justapedia.org/includes/page/Article.php(544): Article->generateContentOutput()
#9 /var/www/justapedia.org/includes/page/CategoryPage.php(61): Article->view()
#10 /var/www/justapedia.org/includes/actions/ViewAction.php(78): CategoryPage->view()
#11 /var/www/justapedia.org/includes/MediaWiki.php(554): ViewAction->show()
#12 /var/www/justapedia.org/includes/MediaWiki.php(331): MediaWiki->performAction()
#13 /var/www/justapedia.org/includes/MediaWiki.php(918): MediaWiki->performRequest()
#14 /var/www/justapedia.org/includes/MediaWiki.php(574): MediaWiki->main()
#15 /var/www/justapedia.org/index.php(50): MediaWiki->run()
#16 /var/www/justapedia.org/index.php(46): wfIndexMain()
#17 {main}