I'm receiving an error on set 'include_body: true'

[steniomelo]

My code is working good.
But when I set the parameter 'include_body' to true I receive the error below.

[gmail] Error: TypeError [ERR_INVALID_ARG_TYPE]: The first argument must be of type string or an instance of Buffer, ArrayBuffer, or Array or an Array-like Object. Received undefined

When I use 'include_body: false' it works.

Can someone help me? Tks

[steniomelo]

I found the error here.

I add a condition on line 72 of gmail-tester.js with this:
if(part.body.data) {

and it work for me. One of the messages returned 'undefined' on 'part.body.data' and it cause the error above.
Then it fixed! Can I submit a pull request for this? Thank you