Object has no attribute 'cancel'

I have been developing a program for a bit now and so far it was working for me, until now. For some weird reason when I run it this error pops up out of nowhere. I really tried everything by now and don't know whats the issue. Somebody please help.

The code is quite long so I will post the part where the problem most likely exists, but I can post the rest if its needed.

                        if p["op"] == "hello":
                            await self.send({"op": "init", "encoded_public_key": self.publicKeyString}, ws)
                            self._heartbeatTask = asyncio.get_event_loop().create_task(self.sendHeartbeat(p["heartbeat_interval"], ws))
                            
                        elif p["op"] == "nonce_proof":
                            nonceHash = hashlib.sha256()
                            nonceHash.update(self.privateKey.decrypt(base64.b64decode(bytes(p["encrypted_nonce"], "utf8")), padding.OAEP(mgf=padding.MGF1(algorithm=hashes.SHA256()), algorithm=hashes.SHA256(), label=None)))
                            nonceHash = base64.urlsafe_b64encode(nonceHash.digest()).decode("utf8")
                            nonceHash = nonceHash.replace("/", "").replace("+", "").replace("=", "")
                            await self.send({"op": "nonce_proof", "proof": nonceHash}, ws)

                        elif p["op"] == "pending_remote_init":
                            await self.on_fingerprint(data=f"https://discordapp.com/ra/{p['fingerprint']}")

                        elif p["op"] == "pending_finish":
                            decryptedUser = self.privateKey.decrypt(base64.b64decode(bytes(p["encrypted_user_payload"], "utf8")), padding.OAEP(mgf=padding.MGF1(algorithm=hashes.SHA256()), algorithm=hashes.SHA256(), label=None)).decode("utf8")
                            decryptedUser = decryptedUser.split(":")
                            await self.on_userdata(user=User(decryptedUser[0], decryptedUser[3], decryptedUser[1], decryptedUser[2]))

                        elif p["op"] == "finish":
                            await self.on_token(token=self.privateKey.decrypt(base64.b64decode(bytes(p["encrypted_token"], "utf8")), padding.OAEP(mgf=padding.MGF1(algorithm=hashes.SHA256()), algorithm=hashes.SHA256(), label=None)).decode("utf8"))
                            break

                        elif p["op"] == "cancel":
                            await self.on_cancel()
                            break
    
214.                self._heartbeatTask.cancel() // This the line with error.
    
                if error:
                    print(f"{y}[{Fore.LIGHTRED_EX}!{y}]{w} RemoteAuthClient disconnected with error. Reconnecting...")
                    self.initCrypto()
                    await self.run()
    
            async def sendHeartbeat(self, interval, _ws):
                while True:
                    await asyncio.sleep(interval/1000)
                    await self.send({"op": "heartbeat"}, _ws)
    
            async def send(self, jsonr, _ws):
                await _ws.send(json.dumps(jsonr))
    
        c = RemoteAuthClient()

The error happens to be in the line 214:

//ERROR MESSAGE
File "...", line 214, in run
    self._heartbeatTask.cancel()
AttributeError: 'NoneType' object has no attribute 'cancel'

On God, any help is appriciated!!