MediaWiki Math extension error: API error: internal_api_err

API error: internal_api_error_DBQueryError

Backtrace:

#0 /var/www/mediawiki/includes/libs/rdbms/database/Database.php(979): Wikimedia\Rdbms\Database->reportQueryError(string, integer, string, string, boolean)
#1 /var/www/mediawiki/includes/libs/rdbms/database/Database.php(1343): Wikimedia\Rdbms\Database->query(string, string)
#2 /var/www/mediawiki/includes/libs/rdbms/database/Database.php(1411): Wikimedia\Rdbms\Database->select(string, array, array, string, array, array)
#3 /var/www/mediawiki/extensions/Math/MathRenderer.php(271): Wikimedia\Rdbms\Database->selectRow(string, array, array, string)
#4 /var/www/mediawiki/extensions/Math/MathRenderer.php(604): MathRenderer->readFromDatabase()
#5 /var/www/mediawiki/extensions/Math/MathTexvc.php(414): MathRenderer->isInDatabase()
#6 /var/www/mediawiki/extensions/Math/MathTexvc.php(381): MathTexvc->isInDatabase()
#7 /var/www/mediawiki/extensions/Math/MathTexvc.php(87): MathTexvc->readCache()
#8 /var/www/mediawiki/extensions/Math/Math.hooks.php(232): MathTexvc->render()
#9 /var/www/mediawiki/extensions/Math/Math.hooks.php(211): MathHooks::mathPostTagHook(MathTexvc, Parser)
#10 /var/www/mediawiki/includes/parser/Parser.php(3852): MathHooks::mathTagHook(string, array, Parser, PPFrame_DOM)
#11 /var/www/mediawiki/includes/parser/Preprocessor_DOM.php(1314): Parser->extensionSubstitution(array, PPFrame_DOM)
#12 /var/www/mediawiki/includes/parser/Parser.php(2921): PPFrame_DOM->expand(DOMElement, integer)
#13 /var/www/mediawiki/includes/parser/Parser.php(1277): Parser->replaceVariables(string)
#14 /var/www/mediawiki/includes/parser/Parser.php(451): Parser->internalParse(string)
#15 /var/www/mediawiki/includes/content/WikitextContent.php(329): Parser->parse(string, Title, ParserOptions, boolean, boolean, NULL)
#16 /var/www/mediawiki/includes/content/AbstractContent.php(516): WikitextContent->fillParserOutput(Title, NULL, ParserOptions, boolean, ParserOutput)
#17 /var/www/mediawiki/includes/page/WikiPage.php(2080): AbstractContent->getParserOutput(Title, NULL, ParserOptions)
#18 /var/www/mediawiki/includes/page/WikiPage.php(1606): WikiPage->prepareContentForEdit(WikitextContent, NULL, User, string, boolean)
#19 /var/www/mediawiki/includes/EditPage.php(2203): WikiPage->doEditContent(WikitextContent, string, integer, boolean, User, string, array, integer)
#20 /var/www/mediawiki/includes/EditPage.php(1514): EditPage->internalAttemptSave(array, boolean)
#21 /var/www/mediawiki/includes/EditPage.php(667): EditPage->attemptSave(array)
#22 /var/www/mediawiki/includes/actions/EditAction.php(60): EditPage->edit()
#23 /var/www/mediawiki/includes/actions/SubmitAction.php(38): EditAction->show()
#24 /var/www/mediawiki/includes/MediaWiki.php(499): SubmitAction->show()
#25 /var/www/mediawiki/includes/MediaWiki.php(293): MediaWiki->performAction(Article, Title)
#26 /var/www/mediawiki/includes/MediaWiki.php(851): MediaWiki->performRequest()
#27 /var/www/mediawiki/includes/MediaWiki.php(523): MediaWiki->main()
#28 /var/www/mediawiki/index.php(43): MediaWiki->run()
#29 {main}