Cannot read property 'isNight' of undefined

[bdovaz]

I have configured it with HACS and I get this error on the latest stable HA release:

simple-weather-card-bundle.js:1 Uncaught (in promise) TypeError: Cannot read property 'isNight' of undefined
at HTMLElement.render (simple-weather-card-bundle.js:1)
at HTMLElement.update (lit-element.ts:217)
at HTMLElement.performUpdate (updating-element.ts:704)
at HTMLElement._enqueueUpdate (updating-element.ts:653)

[eximo84]

Same issue for me but i am configuring this without HACS

[dubilyer]

I've got this problem after the blind copy-paste from the readme 🤦‍♂️.
Probably I don't have an entity named weather.smhi.
After changing it to weather.home everything works like a charm.

@kalkih I suppose it's an expected behavior. Maybe it worth adding a bit more details to console.log.