Random Images show broke links when not thumbnail

Hello,

I am using your plugin in order to display a random image in my sidebar. My settings in the backend for images are, that on thumbnail-click, they should show up in full size within a lightbox.
However, when visiting my page and checking the sidebar, most of the time I see the icon for a broken link above the image caption in your widget.
Now what I found out:

– Once the plugin randomly selects a thumbnail, it is shown and there is no broken link – if it is taller than a thumbnail, the broken link icon occurs.
– broken link or not -> when clicking the image, I am redirected to the file url and see the image in full size
– When rightclicking and browsing the source code, in the image tag I find src=…. and srcset=… Now when I copy what stands in src=… and put it in srcset instead of what was there originally, and hit enter, the image shows up! So your generation of the srcset might not work.

Another issue is, that I would love to have the image opened in a lightbox instead of the attachment page, so please enter the possibility to check lightbox in the random image widget.

Hope I was able to help and looking forward to hear your reply.