I have an issue that my program randomly crash when serialising string fields. I am using c++ and visual studio 2022 for development. protobuf version is 3.21.12

this is my proto def

message FarePurseRequest {
     google.protobuf.Timestamp txnDateTime = 1;
     MessageType msgType = 2;
     string equipmentNo = 3;
     int32 deviceTypeId = 4;
     int32 deviceSeqNo = 5;
     int32 deviceOwnerId = 6;
     string tokenId = 7;
}

This is how I set the string field, string field is equipmentno

fare::FarePurseRequest* msgFarePurseRequest = new fare::FarePurseRequest();

google::protobuf::Timestamp timestamp;
std::time_t now = std::time(nullptr);
timestamp.set_seconds(now);
msgFarePurseRequest->set_allocated_txndatetime(&timestamp);
msgFarePurseRequest->set_msgtype(fare::MessageType::BANK_CARD_BUS_USAGE);
msgFarePurseRequest->set_equipmentno("AG1");

This is how I serialise data

int data_len = msgFarePurseRequest->ByteSizeLong();
char* buffer = new char[data_len];
memset(buffer, 0, data_len);

msgFarePurseRequest->SerializeToArray(buffer, data_len);

This is what I see when run debug mode,

enter image description here

It is triggering from field number 3, when calling VerifyUtf8String()

enter image description here

Appreciate any help,