Hello,
Oh I see, thank you for the notice. It will be fixed in a new theme update.
To fix it now, please edit /wp-content/themes/woopress/js/etheme.js file and add these strings:
if( variation_image.length > 5 ) $( '.woocommerce-main-image img' ).first().attr( 'src', variation_image );
if( variation_image.length > 5 ) $( '.woocommerce-main-image img' ).first().attr( 'srcset', variation_image );
$( '.woocommerce-main-image img' ).first().attr( 'src', o_href );
$( '.woocommerce-main-image img' ).first().attr( 'srcset', o_src );
Regards,
Rose Tyler.