# What this PR does
Sometimes `CustomButtonView` returns HTTP 500 with the following error:
```
apps.alerts.models.custom_button.CustomButton.MultipleObjectsReturned: get() returned more than one CustomButton -- it returned 3!
```
This PR fixes it by adding `.distinct()` to the `CustomButton` queryset
when retrieving an instance + does the same for `WebhooksView`.
## Which issue(s) this PR fixes
Related to https://github.com/grafana/oncall-private/issues/1828
## Checklist
- [x] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)
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