Metamask-extension: TypeError: Cannot read property 'getHostNode' of null

[kumavis]

https://sentry.io/metamask/metamask/issues/500717045/

TypeError: Cannot read property 'getHostNode' of null
  at Object.getHostNode (chrome-extension://nkbihfbeogaeaoehlefnkodbefgpgknn/scripts/popup.js:1:1425656)
  at c.getHostNode (chrome-extension://nkbihfbeogaeaoehlefnkodbefgpgknn/scripts/popup.js:1:1368557)
  at Object.getHostNode (chrome-extension://nkbihfbeogaeaoehlefnkodbefgpgknn/scripts/popup.js:1:1425656)
  at Object.updateChildren (chrome-extension://nkbihfbeogaeaoehlefnkodbefgpgknn/scripts/popup.js:1:1363969)
  at K._reconcilerUpdateChildren (chrome-extension://nkbihfbeogaeaoehlefnkodbefgpgknn/scripts/popup.js:1:1420560)
...
(44 additional frame(s) were not displayed)

[kumavis]

promise handling issue in shapeshift form?

[kumavis]

user hits backbutton before promise resolves?

[danfinlay]

POSSIBLY related to #3688

[danjm]

This is a duplicate of https://github.com/MetaMask/metamask-extension/issues/3690

The sentry logs show that that this 'getHostNode' error happens after the 'Minified react error'. 'getHostNode' errors are always a result of something not rendering due to some other error.

Fix the other error and this one will go away.