An exception occurred while processing your request. Additionally, another exception occurred while executing the custom error page for the first exception. The request has been terminated.

I have integrated custom error handling in asp.net application. Working fine for error status 404 and 500. But 500 error page having db call so in case db server down, we are getting following error:

An exception occurred while processing your request. Additionally, another exception occurred while executing the custom error page for the first exception. The request has been terminated.

Because error happening in custom error page. Is there anyway to handle it?