reading assession.request.pathinfo error

Hello
I am migrating a couple  apps from 

IW 14.2.7 to IW 15.2.55.  both use 3rd party CGDevtools components.

First app recompiled and works great.  Second app has an app violation and I have isolated it down to a a line that of code not in first app.

TIWServerController.IWServerControllerBaseBrowserCheck(  aSession: TIWApplication; var rBrowser: TBrowser);
var s0 :  String;
begin
  s0 := asession.Request.PathInfo;
.......

This code works and allows me to check path info in IW14 no problem.  

In IW15 any idea as to what I am doing wrong here.  I check browser and client info as part of security and also use as part of process to ignore load balancer health checks and closed.

I tried this on a test VM with latest IW 15 version and same. Throws access violation. So what is best way to access the request information when new session is created?

Thanks.