Custom Notification Check Box Cannot be Unchecked

I tried using the new feature, Custom Notifications, in EasyBlog 5.1.8.

It allowed me to check 'Administrator' so that when I was testing, the notification for the blog was only sent to the Administrator group for testing. Great!

However, when I tried to uncheck the 'Administrator' box within the Custom Notification screen within a Blog Post, it would not remove the check box after clicking 'Update Post'.

The only way I could remove the check box so that I could revert back to sending the blog to my 'Site Wide' groups was to go into the database and remove the settings from the 'parameter' field within the blog post.

Could you please review?

Thanks,

Sam