ciii_term_images() return image with no source

Hi,

Thanks for this plugin, very useful, even if I couldn’t enjoy it so far ??
I used it this way: ciii_term_images( 'brands' ) where brand is a custom taxonomy.
It returns an image tag as expected in my template, with a “alt” normally filled with the “brands” term (so the plugin does return the correct term), but there is no source to the image !
<img src alt="my-brand-term" />

Thanks for helping !