Is there a [nogroup] option?

[Thar]

yes there is a [nogroup] at least there use to be.

Strange that you have invite tied to your Big button but if you like it there you can add these last two lines.
/stopmacro [nogroup]
/invite toon1 etc......

Hi

I think you should add the lines more like this:
/stopmacro [group]
/invite toon1 etc...

Else you will stop the macro if you are not in a group. But below are the invites, so you have to stop if you're already in a group.

Greets, Thar