Bot name without text makes it crash

For example, if the bot is called "examplia", you write "examplia,", and...

        Traceback (most recent call last):
          File "/usr/lib/python2.6/dist-packages/twisted/internet/tcp.py", line 463, in doRead
            return self.protocol.dataReceived(data)
          File "/usr/lib/python2.6/dist-packages/twisted/words/protocols/irc.py", line 1705, in dataReceived
            basic.LineReceiver.dataReceived(self, data.replace('\r', ''))
          File "/usr/lib/python2.6/dist-packages/twisted/protocols/basic.py", line 231, in dataReceived
            why = self.lineReceived(line)
          File "/usr/lib/python2.6/dist-packages/twisted/words/protocols/irc.py", line 1713, in lineReceived
            self.handleCommand(command, prefix, params)
        --- <exception caught here> ---
          File "/usr/lib/python2.6/dist-packages/twisted/words/protocols/irc.py", line 1725, in handleCommand
            method(prefix, params)
          File "/usr/lib/python2.6/dist-packages/twisted/words/protocols/irc.py", line 1257, in irc_PRIVMSG
            self.privmsg(user, channel, message)
          File "ircbot.py", line 162, in privmsg
            msg = msg[1:].strip()
        exceptions.IndexError: string index out of range