First level boolean not valid

Hello,

I received an error from the Google Search console about “first level boolean not valid” for both pages on my website that use Modula Gallery.

That’s what is visible on the code of the page related to the error

<script type="application/ld+json">

            [

    false,

    false,

    false,

    false,

    false,

    false,

    false,

    false,

    false,

    false,

    false,

    false,

    false,

    false,

    false

] </script>

How can I fix it?

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