When kiwi backup mikrotik device sometimes i get Client script error: Invalid procedure call or argument on line: 578

Hi, 

I ran into the problem, that I get the following error when backing up:

Client script error: Invalid procedure call or argument on line: 578

It arises without any dependencies. At different times on different devices under different conditions
I'm looking all in the internet to solve this problem, but haven't any result :( 


Kiwi CatTools ver. 3.12 / RouterOS 6.48.6