Cannot convert undefined or null to object

[DarthSonic]

Uncaught TypeError: Cannot convert undefined or null to object
at Function.entries ()
at t.default (tree-1.8.3.min.js:1:9571)
at d.load (tree-1.8.3.min.js:1:3392)
at new d (tree-1.8.3.min.js:1:2846)

I try to load from url but url is not requested at all.

const myTree = new Tree("#WzIndustry", {
    url: "@Url.Action("GetIndustriesWzAsJson", "Data")",
    method: "GET",
    values: null // selected values
});