mem0ai/mem0 · error · KeyError

Vector with ID {vector_id} not found

Error message

Vector with ID {vector_id} not found

What it means

Error "Vector with ID {vector_id} not found" thrown in mem0ai/mem0.

Source

Thrown at mem0/vector_stores/valkey.py:664

            return tuple(self._convert_bytes(item) for item in data)
        return data

    def get(self, vector_id):
        """
        Get a vector by ID.

        Args:
            vector_id (str): ID of the vector to get.

        Returns:
            OutputData: The retrieved vector.
        """
        try:
            key = f"{self.prefix}:{vector_id}"
            result = self.client.hgetall(key)

            if not result:
                raise KeyError(f"Vector with ID {vector_id} not found")

            # Convert bytes keys/values to strings
            result = self._convert_bytes(result)

            logger.debug(f"Retrieved result keys: {result.keys()}")

            # Process the document fields
            payload, memory_id = self._process_document_fields(result, vector_id)

            return OutputData(id=memory_id, payload=payload, score=0.0)
        except KeyError:
            raise
        except Exception as e:
            logger.exception(f"Error getting vector with ID {vector_id}: {e}")
            raise

    def list_cols(self):
        """

View on GitHub (pinned to 001c235229)

Solutions

1. Verify the vector_id exists in the Valkey index before deleting or updating it.

When it happens

Trigger: Thrown at mem0/vector_stores/valkey.py:664 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/f5903ff40526ac7f. Report an issue: GitHub.