Getting a "Can't use an undefined value as an ARRAY reference" error in my KRL code - krl

Question

When I run my Kynetx app I am getting the following error:
Can't use an undefined value as an ARRAY reference at /web/lib/perl/Kynetx/Persistence.pm line 284, <GEN0> line 465.
My code looks like the following:
rule page_loaded is active {
select when pageview "manticore.*" setting()
pre {
savedName = current ent:userName;
}
if (savedName neq "") then {
notify("Hello #{savedName}!!","Welcome back!") with sticky = true;
}
notfired {
raise explicit event name_not_saved_yet;
}
}
I had this code working before, not sure what is killing it now.
UPDATE:
From the debug information.
// 2010/12/07 16:45:31 DEBUG Scheduler.pm a57x4 clear_saved_name Schedule iterator returning email_client with current RID count 0 and current rule count 3
// 2010/12/07 16:45:31 DEBUG Rules.pm a57x4 email_client Rule email_client is active
// 2010/12/07 16:45:31 DEBUG Rules.pm a57x4 email_client [selected] email_client
// 2010/12/07 16:45:31 DEBUG Rules.pm a57x4 email_client
//------------------- begin rule execution: email_client ------------------------
// 2010/12/07 16:45:31 ERROR Rules.pm a57x4 email_client Ruleset a57x4 failed: Can't use an undefined value as an ARRAY reference at /web/lib/perl/Kynetx/Persistence.pm line 284, <GEN0> line 6.

Answer 1

We changed the way that we store trails. I will put a bug fix in asap.
If I show you some secret functionality, you need to promise not to tell
for your entity variable try the syntax (if you have a variable myUserName):
set ent:userName myUserName
Then, for your example, you could write:
pre {
savedName = ent:userName || "";
}
if (savedName neq "") then ....
I will update this answer when we release a fix