Getting Factory property destroys error handling?

[sergya]

I'm trying to develop new Web part and that was I've found. Following code works well:

===
Function getContent(xmlndPart)
...
on error resume next
err.Raise 6
if err.number <> 0 then
...
===

and following one fails with &quot;Script Execution Error: Overflow&quot;:

===
Function getContent(xmlndPart)
...
dim strUser
strUser = Factory.Properties.Item(&quot;LOGON_USER&quot
on error resume next
err.Raise 6
if err.number <> 0 then
...
===

It looks like after having get Factory object property, I'm unable to handle errors using ON ERROR statement.
What's wrong?

Thanks in advance.