hyperledger/fabric · error

error marshaling Header: proto: Marshal called with nil

Error message

error marshaling Header: proto: Marshal called with nil

What it means

GetBytesHeader serializes a *common.Header. Because proto.Marshal cannot accept a nil message, the function checks for nil and returns this explicit error instead. Headers carry channel/type/nonce info used in proposals and transactions.

Source

Thrown at protoutil/proputils.go:183

		return nil, errors.New("error marshaling ChaincodeActionPayload: proto: Marshal called with nil")
	}
	capBytes, err := proto.Marshal(cap)
	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")

View on GitHub (pinned to 2736b63f8f)

Solutions

1. Nil-check the *common.Header before calling GetBytesHeader.
2. Ensure the Header was built via protoutil.ChainHeaderTransaction/SigHeader construction helpers before serialization.
3. When extracting from an envelope/payload, verify the extraction step returned non-nil.
4. In tests, construct &common.Header{ChannelHeader: ..., SignatureHeader: ...} before invoking.

Example fix

// before
hdrBytes, err := protoutil.GetBytesHeader(hdr)
// after
if hdr == nil {
    return nil, errors.New("proposal is missing Header")
}
hdrBytes, err := protoutil.GetBytesHeader(hdr)

if hdr == nil {
    return nil, errors.New("cannot serialize: common.Header is nil")
}

func hasHeader(prop *peer.Proposal) bool {
    return prop != nil && prop.Header != nil
}

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

When it happens

Trigger: Calling protoutil.GetBytesHeader(nil), or passing a Header field from a Proposal that was never built (e.g. makeFailureResponse-style paths in TestProposal where hdr creation was skipped).

Common situations: Constructing proposals/transactions programmatically where the Header (channel header + signature header) assembly step failed or was skipped, or parsing malformed payloads from envelopes.

Related errors

• error marshaling Response: proto: Marshal called with nil
• error marshaling ChaincodeEvent: proto: Marshal called with
• error marshaling ChaincodeActionPayload: proto: Marshal call
• error marshaling ProposalResponse: proto: Marshal called wit
• Cannot read channels list response, %s

AI-assisted analysis of hyperledger/fabric@2736b63f8f (2026-09-04). Data as JSON: /api/errors/4fdc796c5f049f48. Report an issue: GitHub.