Can go back not working always in custom webviewer

Can go back not working in custom webviewer if i create new webviewer id. How fix it?

Make the newly created webview using SetWebView block.
And then call the method.

the author of the extension has been suspended in this community…
for questions about the extension, please ask on his webpage here
http://sunnythedeveloper.epizy.com/2020/05/13/customwebview-an-extended-form-of-web-viewer/

Taifun