Buzz crashes when switching community

**Describe the bug**
Every time I click on a different community the app crashes.

**Steps to reproduce**
1. Add 2 communities
2. Switch between them
3. Buzz fully crashes

**Expected behavior**
No crash

**Version and platform**
Find your version at the bottom of the Settings sidebar. Write "unknown" if you can't determine it.
- Buzz version: 0.5.0 (installed via .deb)
- OS: Ubuntu 24.04.4 LTS

**Logs / additional context**
Paste any relevant logs, error messages, or screenshots here.

```
(WebKitWebProcess:37370): GStreamer-CRITICAL **: 14:52:19.199: gst_value_set_int_range_step: assertion 'start < end' failed

(WebKitWebProcess:37370): GStreamer-CRITICAL **: 14:52:19.199: gst_value_set_int_range_step: assertion 'start < end' failed
Segmentation fault (core dumped)
```

Reproduce the crash with two communities on Buzz 0.5.0 installed from the .deb on Ubuntu 24.04.4, then inspect the GStreamer assertion and segmentation-fault output in the issue. No source file or test is named; done means switching between communities no longer crashes and the reported failure is addressed.

Written by the indexing model from the issue text.