Cannot Add Alt Text to Web Logo

This plugin works perfectly for all my images. Thank you for that.

But there is one image that doesn’t have Alt Text on it. Which is my Web Logo (it’s a Gif). I’ve tried assigning it myself, didn’t work. I’ve tried to leave the Alt Text empty so that the plugin add the Alt Text from the image name, didn’t work either.

I hope you could help me out. Thanks in advance.