commandhandler error after updated the library to the 8.1.0

[91DarioDev]

after i updated the library to 8.1.0 i keep getting this error

 ERROR - An uncaught error was raised while processing the update
Traceback (most recent call last):
  File "/usr/local/lib/python3.5/dist-packages/telegram/ext/dispatcher.py", line 269, in process_update
    for handler in (x for x in self.handlers[group] if x.check_update(update)):
  File "/usr/local/lib/python3.5/dist-packages/telegram/ext/dispatcher.py", line 269, in <genexpr>
    for handler in (x for x in self.handlers[group] if x.check_update(update)):
  File "/usr/local/lib/python3.5/dist-packages/telegram/ext/commandhandler.py", line 137, in check_update
    command = message.text[1:].split(None, 1)[0].split('@')

i did not change a single line of my code and in fact reverting to the previous version of the library i am fine

edit:

steps to reproduce:

• send a text message containing only one word.

it doesn't happen with commands or text containing more than one words or media

edit2:
set the log on DEBUG it also say
IndexError: list index out of range in addition to the previous Traceback

[91DarioDev]

i guess the issue could depend on this ec9b16a#diff-9cd44b48f0b3c83abd861dfd18b28090R137

[jh0ker]

@91DarioDev Do you mean one word or one character?

[SitiSchu]

I can confirm that this happens when you only send one character to the bot.

[SitiSchu]

This can be tested with the echobot2.py example.

[91DarioDev]

@jh0ker yes only one char. it is more than 1 char it's fine. sorry