error with node v8.11.1 on windows

error with node v8.11.1 on windows
```
PS E:\node\SocketToSMPP-master> node .\socketToSms.js
E:\node\SocketToSMPP-master\node_modules\smpp\lib\defs.js:76
                        return value.length + 1;
                                     ^

TypeError: Cannot read property 'length' of undefined
```