We are experiencing intermittent HTTP 500 errors when submitting forms via KoboCollect (Android) on our project. Submissions via the Enketo web link work perfectly with no errors.
Error message:
Error: (500) at https://kf.kobotoolbox.org/submission?deviceID=collect%3AyTTmXlqFatuiLr5E
Affected device:
- Device ID: collect:yTTmXlqFatuiLr5E
- KoboCollect version: v2025.3.3
Context:
- The error occurs intermittently — some submissions from the same device succeed while others fail with 500
- Failures occur both on submissions with and without audio attachments
- 132 KoboCollect submissions have been successfully received; the failing ones remain on the device
- All Enketo/web submissions (76 total) have gone through without any issue
- The project collects data across 4 Central African countries (Cameroon, CAR, DRC, Congo-Brazzaville)
- Data collection is currently ongoing in the field
Steps already taken:
- Re-downloaded the form on the device
- Redeployed the form after fixing XLSForm structural issues (begin_group/end_group formatting, instance_name formula, media column naming)
- Tested submissions with and without audio — errors persist
- Verified all required fields are filled before submission
- Confirmed the server status page shows All Systems Operational
Request:
We would appreciate your help in reviewing the server-side logs for the above device ID and submission endpoint to identify the root cause of the 500 error. Given that data collection is ongoing, a prompt response would be greatly appreciated.
Please do not hesitate to contact us for any additional information.
Best regards
