Major Description
If the hasField method of a Message object is called with an argument that is a repeatable field, an exception is thrown. The ProtobufData getField method does not check to see if a field is repeatable before calling hasField.
protobuf hasField Java doc:
https://developers.google.com/protocol-buffers/docs/reference/java/com/google/protobuf/MessageOrBuilder#hasField(com.google.protobuf.Descriptors.FieldDescriptor)