Unparsable structured data error - logo liquid error

[TechNewbie]

In my Google Search Console I have this error:

On my homepage this is the error on line 2019. On other pages I checked I get the same error, but on line 2018.

      "logo": Liquid error (sections/header line 485): invalid url input,

I believe it is calling to the header.liquid code line 485 which is:

      "logo": {{ settings.logo | image_url: width: 500 | prepend: "https:" | json }},

This is the site:  https://algagendirect.com/

How do I go about fixing this error?

Thanks in advance.