Item callback "drop" firing event ignoring the "dragTo" board values about jkanban HOT 7 CLOSED

jkanban = new jKanban({
    element: '#my_kanban',
    click: function(el) {
        showDialogModal(
            $(el).data("eid"), // item id
            $(el.parentElement.parentElement).data("id") // board id
        );
    },
    dropEl: function(el, target, source, sibling) {
        var allowedBoards = [];
        jkanban.options.boards.map(function (board) {
            if (board.id === $(source.parentElement).data("id")) {
                board.dragTo.map(function (_board) {
                    if (allowedBoards.indexOf(_board) === -1) {
                        allowedBoards.push(_board);
                    }
                });

                return allowedBoards[0];
            }

            return allowedBoards[0];
        });

        if (allowedBoards.length > 0 && allowedBoards.indexOf($(target.parentElement).data("id")) === -1) {
            kanban.drake.cancel(true);
            return;
        }

        var item_id = $(el).data("eid");
        var new_board = target.children("header").data('id');
        $.ajax({
            type: 'POST',
            url: 'localhost/move',
            data: {
                'item_id': item_id,
                'new_board': new_board,
            },
            cache: false,
            success: function (result) {
                console.log("It's done.");
            },
            error: function() {
                console.log("Uh oh! There's an error!");
            }
        });
    }
});