Datatable select row error

Webix JS
#1

i were click datatable row.
however, I got a errorMessage below :
정의되지 않음 또는 null 참조인 ‘id’ 속성을 가져올 수 없습니다.
webix_debug.js (22077, 5)
return this.data.addMark(item.id, “webix_selected”, 0, { $count : 0 }, true);

#2

Hello,

Could you please send a snippet of the problematic code?

Please check the sample with selection in datatable:
https://snippet.webix.com/c54930c4

Also, please check the information of how you can add selection to datatable: https://docs.webix.com/datatable__selection.html