Can't exit asynchronous process - ftp

Question

I have a problem with the exiting from the asynchronous process which is handled by asyncio. This is the ftp server + client project and I want to kill the client process after 'exit' command.
The most important part of this code is here:
class FtpCommandsReceiver:
def __init__(self, loop, sock):
self.loop = loop
self.sock = sock
self.loop.create_task(self.recieve_data())
self.commands_to_handle = {
'exit': self.exit_handler
}
async def recieve_data(self):
while True:
self.data_to_send = input('ftp> ')
if self.data_to_send == '':
continue
await self.loop.sock_sendall(self.sock, self.data_to_send.encode())
try:
await self.commands_to_handle.get(self.data_to_send)()
except TypeError:
pass
self.received_data = await self.loop.sock_recv(self.sock, 10000)
print(self.received_data.decode())
if not self.received_data:
break
print('Connection closed by the server')
self.sock.close()
async def exit_handler(self):
self.loop.stop()
self.loop.close()
if __name__ == '__main__':
loop = asyncio.get_event_loop()
FTP_connection = FtpConnection(loop)
task = loop.create_task(FTP_connection.connect())
try:
loop.run_forever()
finally:
loop.close()
When it calls exit_handler method, the exception raises:
Task exception was never retrieved
future: exception=RuntimeError('Cannot close a running event loop',)>
Traceback (most recent call last):
File "/usr/lib/python3.5/asyncio/tasks.py", line 239, in _step
result = coro.send(None)
File "FTPclient.py", line 54, in recieve_data
await self.commands_to_handle.get(self.data_to_send)()
File "FTPclient.py", line 66, in exit_handler
self.loop.close()
File "/usr/lib/python3.5/asyncio/unix_events.py", line 56, in close
super().close()
File "/usr/lib/python3.5/asyncio/selector_events.py", line 94, in close
raise RuntimeError("Cannot close a running event loop")
RuntimeError: Cannot close a running event loop
I will be grateful for your help and thank you in advance!