piexif.dump issue ***struct.error: ubyte format requires 0 <= number <= 255

[Mostafa-Nakhaei]

as simple as the following code, I get the error:

exif_dict = piexif.load(filename)
exif_bytes = piexif.dump(exif_dict)

error I get:
*** struct.error: ubyte format requires 0 <= number <= 255

Reason:
exif_dict["GPS"][5] is 256 in my photo but the format enforces byte!
I tried to evaluate the exif_dict["GPS"][5] to a tuple ( e.g. (256,) ) but the same issue persisted.

I use python 3.6