Automation to copy label(s) to attached card

[Rudy Holtkamp]

Hi,

I've an automation that mirrors a card to another board. Now I want to add a label to the original card and it should copy it to the mirrored card. 

I've created this automation:

But this does not work properly. What I see is, when I apply a red and purple label on the original:

I get one label, called 'null':

I've tried also with {cardcolor} and a combination of the two, but I get the text 'purple' & 'red', not the colored labels.

How can I fix it?

I only need a one way sync, so all labels on the original should also be seen on the other card.

Cheers,

Rudy