Access violation reading location : CryptProtectData

Question

I'm trying to call CryptProtectData from the Data Protection API (DPAPI):

DATA_BLOB dataIn;
DATA_BLOB dataEncrypted;
BYTE *phrase = (BYTE *)plain.c_str();
DWORD length = strlen((char *)phrase) + 1;
dataIn.pbData = phrase;
dataIn.cbData = length;
if(CryptProtectData(&dataIn, NULL, NULL, NULL, NULL, 
                CRYPTPROTECT_LOCAL_MACHINE, &dataEncrypted))
{
    file.open(filePath, std::ios_base::binary);
    if(!file.is_open())
    {
        return false;
    }
    file.write(reinterpret_cast<char *>(dataEncrypted.pbData),
                dataEncrypted.cbData);
    file.close();
    LocalFree(dataEncrypted.pbData);
    return true;
}

And I'm randomly getting the error:

Exception thrown at 0x77457E67 (ntdll.dll) in test.exe: 0xC00000005:

Access violation reading location 0x24146304

PFA

It's happening seemingly randomly on one machine (Windows Server2012), but seems to work fine on any other machine without error.