"Error Cannot read property 'tree' of undefined" on click event

[mletov]

Hi, Ludo!
Help me, please.
I need load new branch by ajax. I tried your example:

 $(".SPaddBranch").on("click", addBranch);
    function addBranch()
    {
        var node = $(".tbl-targets").treetable("node", "trg-146");
        ....
    }

but i got "Error Cannot read property 'tree' of undefined"

If i simply write
var node = $(".tbl-targets").treetable("node", "trg-146");
not in event handler - all good.
I read about similar error support
but it is different case.