Pimatic.org site gives certifcate error

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When I access the pimatic.org site, I get a certifcate error.
NET::ERR_CERT_AUTHORITY_INVALID
The root certificate has expired in 2012, and is not in the trusted root ca store.

Hi, i’m not experiencing this problem. The certificate i see is valid till 18 juni 2020.

I think it was a problem in Chrome. Edge did not have the problem, and after an update Chrome shows no errors anymore.