Object reference not set to an instance of an object Control Collection

I am using VS2005 (without SP1) and have the following problem.
I have a page that is using report viewer and need to use a number of different report definitions. Because I have not got SP1 installed I can't use the ReportViewer.Reset() method so am getting around this the following way...
ControlCollection coll = ReportViewer1.Parent.Controls;
int oldReportIndex = coll.IndexOf(ReportViewer1);
coll.Remove(ReportViewer1);
coll.AddAt(oldReportIndex, newReportViewer);
This works almost all of the time, however, occasionally I get the "Object reference not set to an instance of an object" on the "ControlCollection coll = ReportViewer1.Parent.Controls" line. I am guessing that it is because the ReportViewer1.Parent.Controls is null....
Does anyone have a nice way of getting around this problem?
Any help on this would be appreciated
Thanks in advanceStart Free Trial