I've (finally) looked at this ticket and reviewed the code and don't
see a way to get a NULL in the client calls to add_timeout().

Before deciding what to do with the ticket I wanted to check and see
if you had any more information, especially if this was seen in 4.1.1
as well as 4.1.0.  I realize the ticket is older and won't be surprised if
you don't have any additional information.

thanks,
Shawn