Handle null referrer in pixel tracking route

Shipped

February 13, 2026 at 7:39 AM UTC

Author

juanisidoro

Commit

3d8d5a7

request.headers.get("referer") returns null when the header is absent (e.g. email clients). The Zod schema uses .optional() which accepts undefined but rejects null, causing silent validation failure and pixel events not being recorded. Fixes #4028