ReferenceError: Can't find variable: fetch

[tdfischer]

https://sentry.io/acorn-software-llc/spacewiki-io/issues/213813625/

ReferenceError: Can't find variable: fetch
  at getPage (/static/cache/app.js:86:19)
  at fetchPage (/static/cache/app.js:438:34)
  at componentDidMount (/static/cache/app.js:424:21)
  at measureLifeCyclePerf (/static/cache/app.js:17716:14)
  at None (/static/cache/app.js:17905:31)
...
(12 additional frame(s) were not displayed)