Hello,
Tested this on https://dev-swiftrizzo.mydwsite1.com/
DW version 9.15.9
Swift version 1.22.0
Video showing the issue.
https://www.screencast.com/t/uelLeJ9lFzUE
Solution we applied.
Line 75 - changed
UserId: "@(Converter.ToString(Pageview.User?.ID))",
to
UserId: "@(Dynamicweb.Core.Converter.ToString(Pageview.User?.ID))",