Cferror catches error, but no error exists

Question

Hello gang .. I got the following issue with one of my
fusebox 4 apps.
Coldfusion complains that a variable is undefined in a page,
the session variable is a dynamic variable that I put together
after collecting some information. Here is how it works.
A student selects a class: 130L
A sudentt selects the location for the class: Location
Then I set the session variable: session.130L_Location = the
value selected (NY)
If the student selects (decide later) for the location of the
class, then I set the value of session.130L_Location to 0
In the fron end, there are no errors reported at all, however
I keep getting the error email saying that session.130L_Location is
undefined. Now the cferror tag is executed, the error email is
sent, but there is no redirection of the user to the error page.
The user stays in the screen they are in and no instances of an
error are showed to the user.
Just so you know .. at all times session.130L_Location is
defined ..
I'm not sure what is going on here ..

Answer 1

Have you tried using <cflog /> to see if infact the
variable is not in the session?
Try putting the cflog in places like: just above any
<cflocation /> tags, at the top
each template, etc.
You may want to create a UDF that accepts a structure you
want to loop over
(form, url, session, etc.) and the use cflog to show
name/value pairs.
BE SURE TO INCLUDE THE SESSION TOKENS (session.urltoken).
<cflog text="#session.urltoken# - the thing you want to
log here" ... />
Good luck!