SEB crashes when opening website

[iquadrat]

Describe the Bug
The SEB crashes when opening specific websites.

1. opening the website https://www.iplocation.net/
2. close the tab
3. opening the website https://www.holidaycheck.ch/hr/bewertungen-hotel-panareti-paphos-resort/fd38e974-1d0b-3392-9b4a-41e98bb6b703

This was found by a teacher when using SEB with classtime.

Steps to Reproduce
Steps to reproduce the behavior:

1. open the log in page: https://www.classtime.com/student/login/RTYHRW
2. download the SEB file and open it in SEB (login/logout password - 12345678)
3. Open question LZ4 and click the link in the description
4. Close the link
5. Open question LZ7 and click the link

On this step, the app will crash

Expected Behavior
No crash, the website opens

Screenshots

Version Information

• OS: Windows
• SEB-Version 3.10

2025-11-21_15h41m32s_Runtime(1).log
2025-11-21_15h41m32s_Client.log

[dbuechel]

Thanks for the report, we can reproduce the issue and will certainly attempt to fix it for the next release version. It appears to be related or the same issue as #1283.

Anwendung: SafeExamBrowser.Client.exe
Frameworkversion: v4.0.30319
Beschreibung: Der Prozess wurde aufgrund einer unbehandelten Ausnahme beendet.
Ausnahmeinformationen: System.NullReferenceException
   bei SafeExamBrowser.Browser.Integrations.MoodleIntegration.TrySearchByCookie(CefSharp.Cookie, System.String ByRef)
   bei SafeExamBrowser.Browser.Handlers.CookieVisitor.Visit(CefSharp.Cookie, Int32, Int32, Boolean ByRef)

[dbuechel]

I was trying to further investigate and reproduce the issue today, but failed to do so. @iquadrat Could you please verify that the above steps still correctly reproduce the crash?

[iquadrat]

Yes, this is still reproducible for 3.10.1 on windows.

[dbuechel]

Thanks, then I'll need to continue investigating what has changed in my development environment.

[dbuechel]

Yes, this is still reproducible for 3.10.1 on windows.

@iquadrat Are you sure that nothing has changed on your end / the setup you've provided above?

I have tried to reproduce the issue on various systems with version 3.10.0 and 3.10.1 (and including the system on which I originally was able to reproduce the crash) ‒ unfortunately without success! When opening the link under question LZ7, I end up on a blocked page, i.e. it appears as if the website holidaycheck.ch specified above is now being blocked by the configuration. I thus attempted to manually disable the network filter in a debug build, which then however leads to the result that I cannot reproduce the issue at all, as previously reported above.

Please revise the setup and retest it (especially regarding the network filter), then let me know once I can retest. I need to be able to reproduce the crash myself in order to reliably fix it, otherwise I can at best perform guesswork with respect to the actual cause.