mem0ai/mem0 · error · ValueError

Memory with id {memory_id} not found. Please provide a valid

Error message

Memory with id {memory_id} not found. Please provide a valid 'memory_id'

What it means

Error "Memory with id {memory_id} not found. Please provide a valid 'memory_id'" thrown in mem0ai/mem0.

Source

Thrown at mem0/memory/main.py:2043

        memory_id = self._create_memory(procedural_memory, {procedural_memory: embeddings}, metadata=metadata)
        capture_event("mem0._create_procedural_memory", self, {"memory_id": memory_id, "sync_type": "sync"})

        result = {"results": [{"id": memory_id, "memory": procedural_memory, "event": "ADD"}]}

        return result

    def _update_memory(self, memory_id, data, existing_embeddings, metadata=None):
        logger.info(f"Updating memory with {data=}")

        try:
            existing_memory = self.vector_store.get(vector_id=memory_id)
        except Exception:
            # Backing-store failure, not a bad memory_id: re-raise the original so the REST layer maps it to 5xx, not 4xx.
            logger.error(f"Error getting memory with ID {memory_id} during update.")
            raise

        if existing_memory is None:
            raise ValueError(f"Memory with id {memory_id} not found. Please provide a valid 'memory_id'")

        prev_value = existing_memory.payload.get("data")
        if data is None:
            data = prev_value
        if not isinstance(data, str):
            raise ValueError(f"Memory with id {memory_id} does not have text content to update")
        text_changed = data != prev_value

        new_metadata = deepcopy(existing_memory.payload)
        if metadata is not None:
            new_metadata.update(_strip_identity_keys(metadata, existing_memory.payload))

        new_metadata["data"] = data
        new_metadata["hash"] = hashlib.md5(data.encode()).hexdigest()
        new_metadata["text_lemmatized"] = lemmatize_for_bm25(data)
        new_metadata["created_at"] = existing_memory.payload.get("created_at")
        new_metadata["updated_at"] = datetime.now(timezone.utc).isoformat()

View on GitHub (pinned to 001c235229)

Solutions

1. Provide a valid existing memory_id; list memories with get_all to find correct IDs.

When it happens

Trigger: Thrown at mem0/memory/main.py:2043 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of mem0ai/mem0@001c235229 (2026-08-15). Data as JSON: /api/errors/4b9f7d19ea6dcbe5. Report an issue: GitHub.