Repeated messenger gets identified as "NA"

Hello SoaresAlisson,
I really do not think it is much of an issue, but a bit of a hassle, that if someone sent one message after another, the subsequents get user identified as "NA", I think I can solve it but I am not a good R coder, if I get a nice solution maybe it could get incorporated to the scraping function.

Thanks for the package, is the best solution that I have seen for this!