AutoNotification Autonotification maybe? weird toast that randomly appears

I'm starting to see this toast appearing randomly, it has only done it for a week or two and I'm not sure why. I haven't changed anything.

https://photos.google.com/share/AF1...?key=c0JrLUhtUXpqdkxoQTZGNGZnSVkxZ2RZRmRsNG9B
I'm on a Mate 9 Android Oreo 8.0

"The callable returned a null value"

Any ideas why it's doing that?

 

Yes of course, although I don't actually know what the trigger is, and it's, very random so it won't be clear if this fixes it

 

I haven't had a repeat of the toast, so perhaps your new version fixed it.