Unset mac-address property

Hi there!,
I’m trying to unset mac-address in all my Hotspot users, I wrote this line of code…

/ip hotspot user set mac-address="" [find]

But not worked, the error is:

invalid value of mac-address, mac address required

I already know that mac-address has the default value “”.

Is this a bug? and, how can I get it work?

Try:
/ip hotspot user unset [ find ] mac-address