Attribute missing

Hello,

I´m facing this issue with a custom script that auto-generates web forms and I can´t figure where to solve this issue. The problem is this:

My script goes as follows:

frappe.ui.form.on("xxxx", {
	create_webform: function(frm) {
		frappe.call({
			method: "frappe.client.get_list", 
			args: { 
				doctype: "yyyy",
				parent: "zzz", 
				filters: { 
					parent: frm.doc.name,
 				}, 
				fields: ["title", "route", "published", "login_required", "success_message", "success_url"] 
			}, 
			callback: function(r) { 
				r.message.forEach(function(v) {
					frappe.call({ 
						method: "frappe.client.insert", 
						args: { 
						        doc: {
								"doctype": "Web Form",
								"name" : v["title"],
								"title" : v["title"],
								"route" : v["route"],
								"doc_type" : "Preguntas",
								"module" : "blablabla",
								"published" : v["published"],
								"success_message" : v["success_message"],
								"success_url" : v["success_url"],
                   						"web_form_fields":[

                                        ],
					        	}
						} 
					})
        		})
			} 
		})
	}
});

I´ve found this topic (Website Generator error - #2 by rmehta) that seems to have the same error but i need to solve it on client side. I´ve tried with

"get_page_info": v["title"]

But it doesn´t work