hyperledger/fabric · error

error marshaling Header

Error message

error marshaling Header

What it means

GetBytesHeader guard: the Header argument is nil, so there is nothing to marshal. The companion error text mimics protobuf's 'Marshal called with nil'; callers passing an uninitialized Header get this immediate rejection instead of a protobuf panic.

Source

Thrown at protoutil/proputils.go:186

	return capBytes, errors.Wrap(err, "error marshaling ChaincodeActionPayload")
}

// GetBytesProposalResponse gets proposal bytes response
func GetBytesProposalResponse(pr *peer.ProposalResponse) ([]byte, error) {
	if pr == nil {
		return nil, errors.New("error marshaling ProposalResponse: proto: Marshal called with nil")
	}
	respBytes, err := proto.Marshal(pr)
	return respBytes, errors.Wrap(err, "error marshaling ProposalResponse")
}

// GetBytesHeader get the bytes of Header from the message
func GetBytesHeader(hdr *common.Header) ([]byte, error) {
	if hdr == nil {
		return nil, errors.New("error marshaling Header: proto: Marshal called with nil")
	}
	bytes, err := proto.Marshal(hdr)
	return bytes, errors.Wrap(err, "error marshaling Header")
}

// GetBytesSignatureHeader get the bytes of SignatureHeader from the message
func GetBytesSignatureHeader(hdr *common.SignatureHeader) ([]byte, error) {
	if hdr == nil {
		return nil, errors.New("error marshaling SignatureHeader: proto: Marshal called with nil")
	}
	bytes, err := proto.Marshal(hdr)
	return bytes, errors.Wrap(err, "error marshaling SignatureHeader")
}

// GetBytesTransaction get the bytes of Transaction from the message
func GetBytesTransaction(tx *peer.Transaction) ([]byte, error) {
	if tx == nil {
		return nil, errors.New("error marshaling Transaction: proto: Marshal called with nil")
	}
	bytes, err := proto.Marshal(tx)
	return bytes, errors.Wrap(err, "error unmarshalling Transaction")

View on GitHub (pinned to 2736b63f8f)

Solutions

1. Inspect the root cause with errors.Cause(err).
2. Align fabric-protos-go and proto runtime versions in go.mod and rebuild.
3. Rebuild the Header using protoutil helpers from fresh ChannelHeader/SignatureHeader values.
4. If the pointer was actually nil, apply the nil guard from the 'Marshal called with nil' variant.

Example fix

// before
hdrBytes, err := protoutil.GetBytesHeader(hdr)
if err != nil {
    return err
}
// after
hdrBytes, err := protoutil.GetBytesHeader(hdr)
if err != nil {
    return errors.Wrap(errors.Cause(err), "cannot serialize Header")
}

if hdr == nil {
    return nil, errors.New("common.Header is nil")
}

func isSerializableHeader(hdr *common.Header) bool {
    return hdr != nil
}

hdrBytes, err := protoutil.GetBytesHeader(hdr)
if err != nil {
    return nil, errors.Wrap(errors.Cause(err), "Header serialization failed")
}

When it happens

Trigger: proto.Marshal failing on a populated *common.Header — usually caused by an inconsistent generated-code/proto-runtime pair, or a Header decoded from invalid/corrupt bytes.

Common situations: Fabric dependency version skew after upgrades (fabric-protos-go vs gogo/protobuf), envelopes parsed from untrusted or truncated sources.

Related errors

• error marshaling Response
• error marshaling ChaincodeEvent
• error marshaling ChaincodeActionPayload
• error marshaling ProposalResponse
• error marshaling

AI-assisted analysis of hyperledger/fabric@2736b63f8f (2026-09-04). Data as JSON: /api/errors/85b126795aab3693. Report an issue: GitHub.