Flagsmith/flagsmith

500 when calling /api/v1/features/featurestates/{pk}/ with empty environment

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#6,597 opened on Jan 27, 2026

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Description

Sentry Issue: FLAGSMITH-API-5GQ

AttributeError: 'NoneType' object has no attribute 'id'
(8 additional frame(s) were not displayed)
...
  File "features/serializers.py", line 578, in validate_environment
    if self.instance and self.instance.environment_id != environment.id:  # type: ignore[union-attr]

Acceptance criteria

  • /api/v1/features/featurestates/{pk}/ responds with HTTP 400 if environment is null in the payload.

Contributor guide

Research direction
Add validation to reject null environment in validate environment in features/serializers.py.
Tech stack
python
Domain
backendapi
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
PythonGitDjango REST framework
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75