[NSFW] SEO Error from Code?

Note: this is an adult website.

I’m not even 100% sure of this is from Age Gate, but I am pretty sure it is. We’re getting an SEO error because there is an empty ALT tag and I suspect that it’s coming from Age Gate.
Here’s the are that I’m encountering an issue with:

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<input type=”hidden” name=”age_gate[confirm]” /> <div class=”age-gate__errors“></div> </form> </div> </div> </template> <img src=”” id=”fsb_image” alt=””/><script>

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It’s the empty ALT tag on the last line: “<img src=”” id=”fsb_image” alt=””/><script>”.

I cannot find any image file in our media library named “fsb”, & I am unable to find any setting that would allow me to insert an ALT tag to that line.

Is this code from Age Gate or someplace else? Any assistance would be greatly appreciated. Thanks!

The page I need help with: [log in to see the link]