Get current call object after Verto FreeSwitch recovering call

Question

How can I get back the currentCall object on a Verto FreeSwitch?
I am using this guide from the Verto Documentation.
When I want to hangup after a tab refresh, I get this error:

Cannot read property 'hangup' of undefined at HTMLButtonElement.hangupCall

and when i try to print it, it says "undefined".
What can I do?

Answer 1

After some research it seems that i didn't read well the doc. My bad.

This line on the onDialog State function make it.

if (!currentCall) {
     currentCall = dialog;
}