Timer Device settings crash UEFN when changed during an active Live Session

Development Programming & Scripting Devices
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Summary:
Changing Timer Device settings while a Live Session is active and connected to Fortnite causes UEFN to freeze and crash. The same Timer Device settings can be changed normally when no Live Session is active.

Steps to Reproduce:

  1. Open a UEFN project.

  2. Start a Live Session and connect to Fortnite.

  3. Select a Timer Device.

  4. Change the Timer Device duration/settings.

  5. UEFN freezes and then crashes.

Expected Result:
The Timer Device setting should update normally without crashing UEFN.

Observed Result:
UEFN freezes and crashes immediately after changing the Timer Device duration/settings while the Live Session is active and connected to Fortnite.

Important Detail:
Changing the same Timer Device settings works normally when the project is opened in UEFN without an active Fortnite Live Session. The crash only happens while Fortnite is connected through a Live Session.

Tested In:
Two separate UEFN projects.

Platform:
PC / Windows

UEFN Version:
v41.00

Fortnite Version:
v41.00

Additional Notes:
I found a similar existing report about devices crashing when changing settings, including the Timer Device duration. However, in my case the crash appears specifically tied to changing Timer Device settings while an active Live Session is connected to Fortnite. Without an active Live Session, the same setting changes work normally.

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