title: Next JS build failing due to ''Export encountered errors on following paths"
body: <p>I am encountering this build error when I deploy my next js site to vercel</p>
  <pre><code>15:02:38    &gt; Build error occurred
  15:02:38    Error: Export encountered errors on following paths:
  15:02:38        /about/undefined
  15:02:38        at exportApp (/vercel/workpath0/node_modules/next/dist/export/index.js:30:1103)
  15:02:38        at processTicksAndRejections (internal/process/task_queues.js:97:5)
  15:02:38        at async /vercel/workpath0/node_modules/next/dist/build/index.js:39:69
  15:02:38        at async /vercel/workpath0/node_modules/next/dist/build/tracer.js:1:525
  </code></pre>
  <p>My website does not have a page called about, so I really don't know what this error is referring to. I checked as much as I could to find a reliable answer, but couldn't. Any help is appreciated!</p>