Garbled error page output using Gzip in ASP.NET / IIS7

Question

I've implemented Rick Strahl's GZipEncodePage method on my site and it works great for the site itself. However, when my code throws an exception the "Server Error" page looks something like this:

I've tried to hooking into Application_Error in an effort to remove the GZip headers but to no avail. How I can reverse the GZipping on error?