struct.error: integer out of range for 'I' format code

[georgbachmann]

Hello,
I am seeing this error here. Any ideas?
Thanks,
Georg

python osm_stitch.py 13.580252 46.830423 13.617129 46.857264 10 ~/Downloads/osm_download-master/out/
Saving map to /Users/georg/Downloads/osm_download-master/out//map.png
Traceback (most recent call last):
  File "osm_stitch.py", line 67, in <module>
    osm_map.save(output + '/map.png')
  File "/Library/Python/2.7/site-packages/PIL/Image.py", line 1693, in save
    save_handler(self, fp, filename)
  File "/Library/Python/2.7/site-packages/PIL/PngImagePlugin.py", line 689, in _save
    o32(im.size[0]), o32(im.size[1]),     # 0: size
  File "/Library/Python/2.7/site-packages/PIL/_binary.py", line 74, in o32be
    return pack(">I", i)
struct.error: integer out of range for 'I' format code