go data_error ai_generated true

error: proto: cannot marshal, message is nil

ID: go/grpc-proto-marshal-error

Also available as: JSON · Markdown · 中文
80%Fix Rate
90%Confidence
0Evidence
2024-01-20First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.0 active — — —

Root Cause

Attempting to marshal a nil protobuf message into bytes, which is not allowed in protobuf.

generic

中文

尝试将 nil protobuf 消息序列化为字节，这在 protobuf 中是不允许的。

Workarounds

  1. 99% success Initialize the message before marshaling 
    msg := &MyMessage{}
b, err := proto.Marshal(msg)
  2. 98% success Use proto.MarshalOptions with deterministic output 
    b, err := proto.MarshalOptions{}.Marshal(msg)

Dead Ends

Common approaches that don't work:

  1. Use a zero-value message instead of nil 50% fail

    A zero-value message still marshals to empty bytes, but if the message is nil, it will panic or error.

  2. Check for nil but continue with empty bytes 40% fail

    You need to handle the nil case explicitly, otherwise the error propagates.