Summary

On OpenMemory API (POST /api/v1/memories/) with infer=true, writes intermittently fail with:
'list' object has no attribute 'replace'.

Environment

• Host: NixOS self-hosted
• OpenMemory image in production: mem0/openmemory-mcp:latest@sha256:3d1836...
• Canary tested: custom build from mem0 v1.0.4 (openmemory/api)
• Vector DB: Qdrant
• Embedder: Ollama (nomic-embed-text, 768 dims)

Repro

1. Configure OpenMemory with Ollama LLM + embedder, Qdrant backend.
2. Call POST /api/v1/memories/ with infer=true.
3. Repeat writes.

Observed

• Intermittent runtime error: 'list' object has no attribute 'replace'
• Endpoint involved: POST /api/v1/memories/

Additional signal

• Canary build from source (v1.0.4) does not reproduce list.replace error.
• It returns explicit vector mismatch when collection dims are wrong:
  expected dim: 1536, got 768.

Temporary mitigation in production

• Keep gateway default infer=false unless explicitly set.
• Fallback to Qdrant path in gateway for resilience.

Related references

• Fix: Openmemory local ollama #3439
• Openmemory config issues #3238