Crash when entering proxy authentication credentials (works in v3.13.4)

I have no support/technical question and have seen the support category. (Be aware that direct support questions will be deleted.)

on

Which general topic do you have

I am experiencing a crash in the latest versions of Nextcloud Desktop when configuring a proxy server that requires authentication.

The issue occurs when entering the proxy username and password. As soon as I provide the credentials (or attempt to save them), the client crashes unexpectedly.

I tested the same configuration with Nextcloud Desktop 3.13.4, and the problem does not occur. Authentication through the proxy works correctly and the client remains stable.

Because of this, I suspect this may be a regression introduced after version 3.13.4.

Steps to reproduce

Install the latest Nextcloud Desktop Client.
Open Settings → Network.
Configure an HTTP/HTTPS proxy that requires authentication.
Enter the proxy username and password.
The client crashes.

Expected behavior

The client should accept and store the proxy credentials and continue running normally.

Actual behavior

The application crashes immediately when proxy authentication credentials are entered.

Additional information

Nextcloud Desktop version: [your version]
Operating system: [Windows version]
Proxy type: [HTTP / HTTPS / SOCKS]
Authentication type: [Basic / NTLM / other]
Last known working version: 3.13.4

I am aware of issue #7996, which was marked as resolved, but I can still reproduce the problem with current versions while version 3.13.4 works correctly on the same system and with the same proxy configuration.