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Editorial Team
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Asked: 2026-06-17T19:21:56+00:00

I get an error message: auth.USR_xID is undefined in Session not quite repeatable but

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I get an error message: “auth.USR_xID is undefined in Session” not quite repeatable but here and there. But the variable is defined in line 25, then used in line 77 and again in line 265 but here it throws an error – I’d say every 1,000th request of that page. 

Line 25: <cfparam name="session.auth.USR_xID" default="#SESSION.auth.USR_ID#">
some more code
Line 77: <cfset USR_Pointer = "#SESSION.auth.USR_xID#">
some more code
Line 265: <cfif session.auth.usr_id IS session.auth.usr_xid>
...

We were trying to find similar cases but couldn’t. We loaded the page, killed the session and then hit submit. Everything worked just fine. We were not able to reproduce the error but it happens. We have over 1 million users on it and 10+ transactions in any given second. Anybody having an idea?

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1 Answer

  1. Editorial Team

    @Derrick gave a good answer. Another possibility is when the user has two instances of your application open. Could be in two tabs or two browser windows. That could cause the two sessions to interfere with each other. It might even be possible for the session to time out in one tab which messes up the other.

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