In /templating-kit/paragraphs/footer/footerAbout.ftl, the following can't work for assets that don't have a title:

    [#assign imageAlt = image.title!image.@name]

image in this case is an instance of info.magnolia.module.templatingkit.dam.Asset; a dms asset "always" has a title (since the title property is automatically filled in on creation in the tree), while an uploaded asset never does. The expression above thus falls back to @name, which can't be interpreted either, as there is no such property (image is an Asset, not a node).

Trivial fix:

    [#assign imageAlt = image.title!image.name]