toExcel don`t wokr with cycle in template

Hello. I have some problem. I have in templates functions in my datables columns cycle to form data. And with this function toExcel don`t work.
look snippet.
https://snippet.webix.com/xypiglso
Thank you for attention.

Hello,

The template function is supposed to return a string that is painted in each cell. In your case, an array is returned instead.

While datatable rendering logic copes with this inconsistency, the export code does not. We will add a fix for this case in the next version while currently you can explicitly provide a string connected with array.join()

Check the following snippet, please: https://snippet.webix.com/fxzwwrlo

By the way, you can easily track such export errors as:

webix.toExcel($$("table")).fail(function(err){
   console.log(err);
});

Oh. thank you very much