telegram.py ValueError: I/O operation on closed file.

[simonsmh]

Traceback (most recent call last):
File "/root/fishroom/fishroom/runner.py", line 37, in wrapper
f(*args, **kwargs)
File "/root/fishroom/fishroom/telegram.py", line 692, in Telegram2FishroomThread
for msg in tg.message_stream(id_blacklist=tele_me):
File "/root/fishroom/fishroom/telegram.py", line 540, in message_stream
telemsg = self.parse_jmsg(jmsg)
File "/root/fishroom/fishroom/telegram.py", line 372, in parse_jmsg
url, err = self.upload_sticker(file_id)
File "/root/fishroom/fishroom/telegram.py", line 284, in upload_sticker
photo = webp2png(sticker)
File "/root/fishroom/fishroom/helpers.py", line 50, in webp2png
im.save(out, "PNG")
File "/usr/local/lib/python3.6/dist-packages/PIL/Image.py", line 1895, in save
self.load()
File "/usr/local/lib/python3.6/dist-packages/PIL/ImageFile.py", line 205, in load
seek(offset)
ValueError: I/O operation on closed file.