TypeError: Cannot read property 'slug' of undefined
    at post.fields.topics.forEach (/app/controllers/blog.js:204:27)
    at Array.forEach (native)
    at CMS.getEntries.then (/app/controllers/blog.js:203:28)
    at run (/app/node_modules/core-js/library/modules/es6.promise.js:108:47)
    at /app/node_modules/core-js/library/modules/es6.promise.js:119:28
    at flush (/app/node_modules/core-js/library/modules/$.microtask.js:19:5)
    at wrapped (/app/node_modules/newrelic/lib/transaction/tracer/index.js:184:28)
    at _combinedTickCallback (internal/process/next_tick.js:73:7)
    at process._tickDomainCallback [as _tickCallback] (internal/process/next_tick.js:128:9)