Shopify liquid error 'invalid url input' in json

Custom Shopify 2.0 theme built on Dawn. Using Customize and selecting an image from Settings > Files. Image appears correctly in Customize and appears correctly in the website. However, the console shows this error in the json (btw line 13 in the section refered to is blank)...

<blockquote>
          <p></p>
          <cite>
            <img
              alt=""
              height="0"
              loading="lazy"
              src="Liquid error (sections/media-quotes.liquid line 13): invalid url input"
              width="0"
            />
          </cite>
       </blockquote>
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