When trying to translate [[https://es.wikipedia.org/w/index.php?title=Especial:Traducci%C3%B3n_de_contenidos&page=Vantaa&from=en&to=es&targettitle=Vantaa|en:Vantaa to Spanish]] and adding first paragraph after infobox, cxserver error occurs. By inspecting the request, we get following response:
```
TypeError: Cannot read property 'replace' of undefined
at siteInfoRequest.then (/srv/service/lib/mw/ApiRequestManager.js:194:18)
at tryCatcher (/srv/service/node_modules/bluebird/js/release/util.js:16:23)
at Promise._settlePromiseFromHandler (/srv/service/node_modules/bluebird/js/release/promise.js:517:31)
at Promise._settlePromise (/srv/service/node_modules/bluebird/js/release/promise.js:574:18)
at Promise._fulfillPromises (/srv/service/node_modules/bluebird/js/release/promise.js:674:14)
at Promise._settlePromises (/srv/service/node_modules/bluebird/js/release/promise.js:700:18)
at _drainQueueStep (/srv/service/node_modules/bluebird/js/release/async.js:138:12)
at _drainQueue (/srv/service/node_modules/bluebird/js/release/async.js:131:9)
at Async._drainQueues (/srv/service/node_modules/bluebird/js/release/async.js:147:5)
at Immediate.Async.drainQueues [as _onImmediate] (/srv/service/node_modules/bluebird/js/release/async.js:17:14)
at runCallback (timers.js:705:18)
at tryOnImmediate (timers.js:676:5)
at processImmediate (timers.js:658:5)
```