Undo Group is open error

[jaydude-wb]

"After Effects can't copy layer with a parent of with a linked expression while an Undo Group is open."

I get this error when I try to copy some layers, that indeed are involved in parenting.

Nevertheless, I just wanna copy these, regardless of any 'Undo Groups'.

Think it is some kind of coding issue, or a poor desicription in the error message.

It appeared first while working with an extension,  in a fresh updated Ae - version 23.5.0 (build 52).

[dumbeau]

Is this your own extension?  If a script doesn't include the 

app.beginUndoGroup("Undo Group Name");

somewhere at the beginning of the script or action, and then

app.endUndoGroup();

somewhere at the end of the script or action, then you will run into these errors.  This was the case for me.

Now if you have a certain downloaded plugin that causes this issue, you'll have to post on the plugin maker's page, what's the extension?