Hello @maxwww! Thanks for sharing your sites. I understand you’re concerned about the error flagged by Google PageSpeed Insights.
It’s worth noting that the handheld footer bar search is not exactly a link and doesn’t need to be crawled, which is why it has an empty href attribute. However, I can see why you’d want to resolve this issue to pass the PageSpeed Insights reports.
There’s a function in this GitHub thread below that could help fix this.
Handheld footer bar search – Empty href attribute – Bad for PageSpeed Insights / SEO score?#2074
Could you give it a try and let me know how it goes? Looking forward to hearing from you!