error using in2csv when piping xlsx stdin

Created by: alexsmartsky

Great library. I tried a lot of excel converters with unreliable results before I came across this solution.

I'm trying to pipe an xlsx file to in2csv and I get the error - "coercing to Unicode: need string or buffer, NoneType found"

Although I'm using nodeJS to pipe the excel file to in2csv, the same error comes up when you simply

cat file.xlsx | in2csv -f xlsx       <--- Error!
in2csv -f xlsx file.xlsx       <--- works perfectly

I don't have a lot of experience with file manipulation. Am I missing something or is there a bug?

Thanks, Alex