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Request a Feature Report a Bug
Completed
Last Updated: 02 Sep 2026 15:56 by JP
Release 2026 Q3
Owen
Created on: 09 Jul 2026 09:04
Category: AsyncUpload
Type: Bug Report
0
Disabling session state and csrf causes null reference exception when using async upload

If both the CSRF validation and the Session state is turned off, the pages containing AsyncUpload control will throw a null reference exception.

<appSettings>
  <add key="Telerik.AsyncUpload.EnableCsrfValidation" value="false" />
</appSettings>
<system.web>
  <sessionState mode="Off" />

2 comments
JP
Posted on: 02 Sep 2026 15:56

We just updated to Q3 2026 to see if this had been addressed. While null reference exception is not thrown, the upload itself seems to be failing when session state is disabled. When session state is enabled, it works fine though. Please check below screenshot that shows uploading failure and the network response.

 

Here is the markup, is there anything else that we need to configure?

 

ADMIN
Attila Antal
Posted on: 10 Jul 2026 08:04

Hi Owen,

Thank you for taking the time to report the regression and for providing such clear details. Your feedback helped us pinpoint the issue quickly.

I’m glad to confirm that the problems you identified have now been fixed. These improvements will be included in our upcoming 2026 Q3 release.

We appreciate your diligence and support.

Regards,
Attila Antal
Progress Telerik

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