Drill through from active report to another active report

[Bindiya]

Hi,
We have an active report, say A1, which has a drill through to another active report, say A2 (no parameters passed).
When I run A1 and click to open A2, it throws "Unable to set property 'innerHTML' of undefined or null reference" error. This most of the times happens on first click. When I try again, it works fine.
Both these A1 and A2 are saved versions on Cognos Connections. We are on Cognos 10.2.2 and IE 11.

What could be the reason and is there any workaround?

Thanks.