PyAudio Memory Error

I am having an issue with my code which causes a memory error. I believe it is caused by this function (see below).

def sendAudio():
    p = pyaudio.PyAudio()
    stream = p.open(format = FORMAT,
                    channels = CHANNELS,
                    rate = RATE,
                    input = True,
                    output = True,
                    frames_per_buffer = chunk)

    data = stream.read(chunk)
    client(chr(CMD_AUDIO), encrypt_my_audio_message(data))

def keypress(event):
    if event.keysym == 'Escape':
        root.destroy()
    if event.keysym == 'Control_L':
        #print("Sending Data...")
        sendAudio()
        #print("Data Sent!")

What the function does is read from the microphone then send that data over the network. But since any time the key is pressed and there is any data it sends it (this could be white noise etc). Is there a way I can just have it less glitchy I am not sure this is the right approach to this situation using a keypress I mean.

Thnak you for your reply the error I get is

Exception in thread Thread-1:
Traceback (most recent call last):
  File "C:\Python27\lib\threading.py", line 552, in __bootstrap_inner
    self.run()
  File "C:\Python27\lib\threading.py", line 505, in run
    self.__target(*self.__args, **self.__kwargs)
  File "chat.py", line 62, in server
    frames_per_buffer = chunk)
  File "C:\Python27\lib\site-packages\pyaudio.py", line 714, in open
    stream = Stream(self, *args, **kwargs)
  File "C:\Python27\lib\site-packages\pyaudio.py", line 396, in __init__
    self._stream = pa.open(**arguments)
IOError: [Errno Insufficient memory] -9992

What's the exception you're getting? If it's an input overflow from PortAudio, you can try increasing the chunk size. Also, when the buffer is overflowing on white noise, it can be handled by catching the exception and returning a blank stream:

try:
    data = stream.read(chunk)
except IOError as ex:
    if ex[1] != pyaudio.paInputOverflowed:
        raise
    data = '\x00' * chunk  # or however you choose to handle it, e.g. return None