6.16 import stops when there is a duplicate entry

Could you prepare the script that way

do { /ip firewall address-list add address=111.251.111.129 list=blackmail timeout=3h } on-error={}

instead of

/ip firewall address-list add address=111.251.111.129 list=blackmail timeout=3h

I have no 6.16 so it is only my guess that such solution works.