Is this a 'ngrok' problem?

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I'm going through this great tutorial to build a shopify app with node, react and polaris! I love it.

Anyway I'm in the dev store > Apps > 

And my app renders but then disappears.

I suspect it might be ngrok as I am getting that error a few times. See pic below.


Any help would be appreciated!


Screenshot 2019-07-10 13.08.37.png