paritytech/substrate-ui

React: cannot read property 'key' of undefined

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Hello I'm following the steps at https://substrate.readme.io/docs/creating-a-custom-substrate-chain

I'm getting this error in Chrome with react dev tools installed (and uninstalled) and also in Firefox.

Chrome: 70.0.3538.67 (Official Build) (64-bit)
Firefox: 64.0.2 (64-bit)

selection_083

I will keep playing and update here as I find things.

Here's the log from Firefox:

selection_084

Sorry this is a dupe of #14 - running npm run build gives same result for me