MediaWiki API result

This is the HTML representation of the JSON format. HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format. To see the non-HTML representation of the JSON format, set format=json.
See the complete documentation, or the API help for more information.
{
    "batchcomplete": "",
    "query": {
        "backlinks": []
    }
}{
    "error": {
        "code": "internal_api_error_DBTransactionStateError",
        "info": "[36195456bac7fdbd4bafc51a] Exception caught: A database query error has occurred. This may indicate a bug in the software.",
        "errorclass": "Wikimedia\\Rdbms\\DBTransactionStateError",
        "*": "Wikimedia\\Rdbms\\DBTransactionStateError at /usr/share/webapps/mediawiki/includes/libs/Rdbms/Database/TransactionManager.php(167)\nfrom /usr/share/webapps/mediawiki/includes/libs/Rdbms/Database/TransactionManager.php(167)\n#0 /usr/share/webapps/mediawiki/includes/libs/Rdbms/Database/Database.php(1016): Wikimedia\\Rdbms\\TransactionManager->assertTransactionStatus()\n#1 /usr/share/webapps/mediawiki/includes/libs/Rdbms/Database/Database.php(632): Wikimedia\\Rdbms\\Database->assertQueryIsCurrentlyAllowed()\n#2 /usr/share/webapps/mediawiki/includes/libs/Rdbms/Database/Database.php(1368): Wikimedia\\Rdbms\\Database->query()\n#3 /usr/share/webapps/mediawiki/includes/libs/Rdbms/Database/Database.php(1317): Wikimedia\\Rdbms\\Database->select()\n#4 /usr/share/webapps/mediawiki/includes/libs/Rdbms/Database/DBConnRef.php(129): Wikimedia\\Rdbms\\Database->selectField()\n#5 /usr/share/webapps/mediawiki/includes/libs/Rdbms/Database/DBConnRef.php(371): Wikimedia\\Rdbms\\DBConnRef->__call()\n#6 /usr/share/webapps/mediawiki/includes/libs/Rdbms/QueryBuilder/SelectQueryBuilder.php(779): Wikimedia\\Rdbms\\DBConnRef->selectField()\n#7 /usr/share/webapps/mediawiki/includes/Language/LCStoreDB.php(58): Wikimedia\\Rdbms\\SelectQueryBuilder->fetchField()\n#8 /usr/share/webapps/mediawiki/includes/Language/LocalisationCache.php(548): MediaWiki\\Language\\LCStoreDB->get()\n#9 /usr/share/webapps/mediawiki/includes/Language/LocalisationCache.php(598): MediaWiki\\Language\\LocalisationCache->getFromStore()\n#10 /usr/share/webapps/mediawiki/includes/Language/LocalisationCache.php(421): MediaWiki\\Language\\LocalisationCache->loadSubitem()\n#11 /usr/share/webapps/mediawiki/includes/Language/MessageCache.php(671): MediaWiki\\Language\\LocalisationCache->getSubitem()\n#12 /usr/share/webapps/mediawiki/includes/Language/MessageCache.php(1284): MediaWiki\\Language\\MessageCache->isMainCacheable()\n#13 /usr/share/webapps/mediawiki/includes/Language/MessageCache.php(1150): MediaWiki\\Language\\MessageCache->getMsgFromNamespace()\n#14 /usr/share/webapps/mediawiki/includes/Language/MessageCache.php(1123): MediaWiki\\Language\\MessageCache->getMessageForLang()\n#15 /usr/share/webapps/mediawiki/includes/Language/MessageCache.php(1028): MediaWiki\\Language\\MessageCache->getMessageFromFallbackChain()\n#16 /usr/share/webapps/mediawiki/includes/Language/Message/Message.php(1538): MediaWiki\\Language\\MessageCache->get()\n#17 /usr/share/webapps/mediawiki/includes/Language/Message/Message.php(1037): MediaWiki\\Message\\Message->fetchMessage()\n#18 /usr/share/webapps/mediawiki/includes/Language/Message/Message.php(1176): MediaWiki\\Message\\Message->format()\n#19 /usr/share/webapps/mediawiki/includes/Output/OutputPage.php(1176): MediaWiki\\Message\\Message->escaped()\n#20 /usr/share/webapps/mediawiki/includes/Api/ApiFormatBase.php(278): MediaWiki\\Output\\OutputPage->setPageTitleMsg()\n#21 /usr/share/webapps/mediawiki/includes/Api/ApiMain.php(2308): MediaWiki\\Api\\ApiFormatBase->closePrinter()\n#22 /usr/share/webapps/mediawiki/includes/Api/ApiMain.php(2054): MediaWiki\\Api\\ApiMain->printResult()\n#23 /usr/share/webapps/mediawiki/includes/Api/ApiMain.php(949): MediaWiki\\Api\\ApiMain->executeAction()\n#24 /usr/share/webapps/mediawiki/includes/Api/ApiMain.php(920): MediaWiki\\Api\\ApiMain->executeActionWithErrorHandling()\n#25 /usr/share/webapps/mediawiki/includes/Api/ApiEntryPoint.php(138): MediaWiki\\Api\\ApiMain->execute()\n#26 /usr/share/webapps/mediawiki/includes/MediaWikiEntryPoint.php(180): MediaWiki\\Api\\ApiEntryPoint->execute()\n#27 /usr/share/webapps/mediawiki/api.php(30): MediaWiki\\MediaWikiEntryPoint->run()\n#28 {main}"
    }
}