Automation Editor java script error with version 0.80.0

Configuration
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Sice I’ve updated to the new version 0.80.0 I can no longer create of edit automations using the automations editor.
I see the following error in my java script console:

286a08fb18870c9c81b7.chunk.js:1 Uncaught (in promise) TypeError: Cannot read property 'hours' of undefined
    at state_StateTrigger.render (286a08fb18870c9c81b7.chunk.js:1)
    at renderComponent (8752a4221f36038e73c0.chunk.js:1)
    at setComponentProps (8752a4221f36038e73c0.chunk.js:1)
    at buildComponentFromVNode (8752a4221f36038e73c0.chunk.js:1)
    at idiff (8752a4221f36038e73c0.chunk.js:1)
    at innerDiffNode (8752a4221f36038e73c0.chunk.js:1)
    at idiff (8752a4221f36038e73c0.chunk.js:1)
    at diff (8752a4221f36038e73c0.chunk.js:1)
    at renderComponent (8752a4221f36038e73c0.chunk.js:1)
    at setComponentProps (8752a4221f36038e73c0.chunk.js:1)

I’m using Chrome 69.0.3497.100 on Windows with HassOS on a Raspi 3.

Edit: someone reported this issue on GitHub: https://github.com/home-assistant/home-assistant-polymer/issues/1768

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See this thread for further information.