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M
159
Moderate
MongoDB · Database Server & Atlas
MongoDB server reported: Conversion Failure.
Quick Answer
Error code 159 on your MongoDB Database Server & Atlas means: MongoDB server reported: Conversion Failure.. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
MONGO-ATLAS-DEDICATEDMONGO-ATLAS-SERVERLESSMONGO-COMM-6.0MONGO-COMM-7.0MONGO-COMM-8.0MONGO-ENT-6.0MONGO-ENT-7.0MONGO-ENT-8.0
Likely Causes
  1. MongoDB returned code 159 (ConversionFailure) while processing this request path.
  2. A lower-level subsystem raised a non-recoverable error for this request.
  3. An internal runtime condition interrupted normal command execution.
How to Fix It
1
Review logs/telemetry for code 159 (ConversionFailure) and capture the exact command and parameters that triggered it.
2
Retry once after confirming system health and dependency availability.
3
Escalate recurring failures with reproducible traces and version/build details.
4
Collect server/client logs with request IDs and stack context for the failing call.
5
Add monitoring for recurring ConversionFailure events so future incidents are detected and triaged faster.
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Related Error Codes
12456
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