TypeError: null is not an object (evaluating 't.toString')

[sentry-io]

Sentry Issue: METAMASK-MOBILE-23GS

TypeError: null is not an object (evaluating 't.toString')
  at e.toWei (app/util/number/index.js:421:18)
  at _ref3 (app/components/UI/Swaps/QuotesView.js:820:11)
...
(11 additional frame(s) were not displayed)