Nick Sukhanov

Randomly occurs: ``` /var/www/prerender/node_modules/prerender-mongodb-cache/lib/mongoCache.js:46 │······························································ database.collection('pages', function(err, collection) { │······························································ ^ │······························································ TypeError: Cannot call method 'collection' of undefined │······························································ at Object.mongo_cache.get (/var/www/prerender/node_modules/prerender-mongodb-cache/lib/mongoCache.js:46:18) │······························································ at Object.module.exports.beforePhantomRequest (/var/www/prerender/node_modules/prerender-mongodb-cache/lib/mongoCache.js:28:20) │······························································ at next...