# Buggy code
def handle_timedout_limit_sell(self, trade: Trade, order: Dict) -> bool:
    """
    Sell timeout - cancel order and update trade
    :return: True if order was fully cancelled
    """
    if order["remaining"] == order["amount"]:
        # if trade is not partially completed, just cancel the trade
        if order["status"] != "canceled":
            reason = "due to timeout"
            self.exchange.cancel_order(trade.open_order_id, trade.pair)
            logger.info("Sell order timeout for %s.", trade)
        else:
            reason = "on exchange"
            logger.info("Sell order canceled on exchange for %s.", trade)
        trade.close_rate = None
        trade.close_profit = None
        trade.close_date = None
        trade.is_open = True
        trade.open_order_id = None
        self.rpc.send_msg(
            {
                "type": RPCMessageType.STATUS_NOTIFICATION,
                "status": f"Unfilled sell order for {trade.pair} cancelled {reason}",
            }
        )

        return True

    # TODO: figure out how to handle partially complete sell orders
    return False


# Traceback (Exception)
2020-02-20 22:47:28,025 - freqtrade - ERROR - Fatal exception!
Traceback (most recent call last):
File "/opt/tradebot/freqtrade/.env/lib/python3.7/site-packages/talib/__init__.py", line 20, in wrapper
for arg in chain(args, kwargs.values())
StopIteration

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/freqtrade/freqtrade/main.py", line 36, in main
return_code = args['func'](args)
File "/freqtrade/freqtrade/commands/optimize_commands.py", line 76, in start_hyperopt
hyperopt.start()
File "/freqtrade/freqtrade/optimize/hyperopt.py", line 488, in start
preprocessed = self.backtesting.strategy.tickerdata_to_dataframe(data)
File "/freqtrade/freqtrade/strategy/interface.py", line 448, in tickerdata_to_dataframe
for pair, pair_data in tickerdata.items()}
File "/freqtrade/freqtrade/strategy/interface.py", line 448, in <dictcomp>
for pair, pair_data in tickerdata.items()}
File "/freqtrade/freqtrade/strategy/interface.py", line 464, in advise_indicators
return self.populate_indicators(dataframe, metadata)
File "/freqtrade/user_data/strategies/MyDev.py", line 205, in populate_indicators
dataframe['mfi'] = ta.MFI(dataframe)
File "talib/_abstract.pxi", line 352, in talib._ta_lib.Function.__call__
File "talib/_abstract.pxi", line 383, in talib._ta_lib.Function.__call_function
File "/opt/tradebot/freqtrade/.env/lib/python3.7/site-packages/talib/__init__.py", line 24, in wrapper
return func(*args, **kwargs)
File "talib/_func.pxi", line 8454, in talib._ta_lib.MFI
Exception: volume is not double

# Fixed code
def handle_timedout_limit_sell(self, trade: Trade, order: Dict) -> bool:
    """
    Sell timeout - cancel order and update trade
    :return: True if order was fully cancelled
    """
    # if trade is not partially completed, just cancel the trade
    if order["remaining"] == order["amount"]:
        if order["status"] != "canceled":
            reason = "cancelled due to timeout"
            # if trade is not partially completed, just delete the trade
            self.exchange.cancel_order(trade.open_order_id, trade.pair)
            logger.info("Sell order %s for %s.", reason, trade)
        else:
            reason = "cancelled on exchange"
            logger.info("Sell order %s for %s.", reason, trade)

        trade.close_rate = None
        trade.close_profit = None
        trade.close_date = None
        trade.is_open = True
        trade.open_order_id = None

        return True

    # TODO: figure out how to handle partially complete sell orders
    return False