hyperledger/fabric · error

block data is nil

Error message

block data is nil

What it means

extractBlockFromResponse guard: a DeliverResponse_Block arrived whose Block.Data is nil. A structurally valid Fabric block always carries a data section, so the remote orderer (or the stream) produced a malformed/empty block; used by block pulling and last-block-sequence fetch during RAFT replication.

Source

Thrown at orderer/common/cluster/deliver.go:462

	}

	if err = stream.Send(env); err != nil {
		p.Logger.Errorf("Failed sending seek envelope to %s: %v", endpoint, err)
		stream.abort()
		return nil, err
	}
	return stream, nil
}

func extractBlockFromResponse(resp *orderer.DeliverResponse) (*common.Block, error) {
	switch t := resp.Type.(type) {
	case *orderer.DeliverResponse_Block:
		block := t.Block
		if block == nil {
			return nil, errors.New("block is nil")
		}
		if block.Data == nil {
			return nil, errors.New("block data is nil")
		}
		if block.Header == nil {
			return nil, errors.New("block header is nil")
		}
		if block.Metadata == nil || len(block.Metadata.Metadata) == 0 {
			return nil, errors.New("block metadata is empty")
		}
		return block, nil
	case *orderer.DeliverResponse_Status:
		if t.Status == common.Status_FORBIDDEN {
			return nil, ErrForbidden
		}
		if t.Status == common.Status_SERVICE_UNAVAILABLE {
			return nil, ErrServiceUnavailable
		}
		return nil, errors.Errorf("faulty node, received: %v", resp)
	default:
		return nil, errors.Errorf("response is of type %v, but expected a block", reflect.TypeOf(resp.Type))

View on GitHub (pinned to 2736b63f8f)

Solutions

1. Pull the block from a different orderer endpoint
2. Check the source node's ledger/file integrity and restart it if corrupted
3. Upgrade mismatched fabric binaries so block serialization is consistent

if block := resp.GetBlock(); block != nil && block.Data == nil {
    return fmt.Errorf("block data missing in response")
}

func hasBlockData(resp *orderer.DeliverResponse) bool {
    return resp.GetBlock() != nil && resp.GetBlock().Data != nil
}

block, err := extractBlockFromResponse(resp)
if err != nil {
    return fmt.Errorf("skipping invalid block from %s: %w", endpoint, err)
}

When it happens

Trigger: extractBlockFromResponse received a DeliverResponse_Block where block.Data is nil, i.e. the remote deliver service sent a block header without data.

Common situations: Corrupted block storage or serialization bug on the source orderer; version incompatibility producing partially-populated block protos.

Related errors

• block is nil
• block header is nil
• block metadata is empty
• deliver client identity expired %v before
• message is nil

AI-assisted analysis of hyperledger/fabric@2736b63f8f (2026-09-04). Data as JSON: /api/errors/36c57c7a4ba9930e. Report an issue: GitHub.