# Buggy code
def handle_timedout_limit_buy(self, trade: Trade, order: Dict) -> bool:
    """
    Buy timeout - cancel order
    :return: True if order was fully cancelled
    """
    reason = "cancelled due to timeout"
    if order["status"] != "canceled":
        corder = self.exchange.cancel_order(trade.open_order_id, trade.pair)
    else:
        # Order was cancelled already, so we can reuse the existing dict
        corder = order
        reason = "canceled on Exchange"

    if corder.get("remaining", order["remaining"]) == order["amount"]:
        # if trade is not partially completed, just delete the trade
        self.handle_buy_order_full_cancel(trade, reason)
        return True

    # if trade is partially complete, edit the stake details for the trade
    # and close the order
    # cancel_order may not contain the full order dict, so we need to fallback
    # to the order dict aquired before cancelling.
    # we need to fall back to the values from order if corder does not contain these keys.
    trade.amount = order["amount"] - corder.get("remaining", order["remaining"])
    trade.stake_amount = trade.amount * trade.open_rate
    # verify if fees were taken from amount to avoid problems during selling
    try:
        new_amount = self.get_real_amount(
            trade, corder if "fee" in corder else order, trade.amount
        )
        if not isclose(order["amount"], new_amount, abs_tol=constants.MATH_CLOSE_PREC):
            trade.amount = new_amount
            # Fee was applied, so set to 0
            trade.fee_open = 0
            trade.recalc_open_trade_price()
    except DependencyException as e:
        logger.warning("Could not update trade amount: %s", e)

    trade.open_order_id = None
    logger.info("Partial buy order timeout for %s.", trade)
    self.rpc.send_msg(
        {
            "type": RPCMessageType.STATUS_NOTIFICATION,
            "status": f"Remaining buy order for {trade.pair} cancelled due to timeout",
        }
    )
    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_buy(self, trade: Trade, order: Dict) -> bool:
    """
    Buy timeout - cancel order
    :return: True if order was fully cancelled
    """
    if order["status"] != "canceled":
        reason = "cancelled due to timeout"
        corder = self.exchange.cancel_order(trade.open_order_id, trade.pair)
        logger.info("Buy order %s for %s.", reason, trade)
    else:
        # Order was cancelled already, so we can reuse the existing dict
        corder = order
        reason = "cancelled on exchange"
        logger.info("Buy order %s for %s.", reason, trade)

    if corder.get("remaining", order["remaining"]) == order["amount"]:
        # if trade is not partially completed, just delete the trade
        Trade.session.delete(trade)
        Trade.session.flush()
        return True

    # if trade is partially complete, edit the stake details for the trade
    # and close the order
    # cancel_order may not contain the full order dict, so we need to fallback
    # to the order dict aquired before cancelling.
    # we need to fall back to the values from order if corder does not contain these keys.
    trade.amount = order["amount"] - corder.get("remaining", order["remaining"])
    trade.stake_amount = trade.amount * trade.open_rate
    # verify if fees were taken from amount to avoid problems during selling
    try:
        new_amount = self.get_real_amount(
            trade, corder if "fee" in corder else order, trade.amount
        )
        if not isclose(order["amount"], new_amount, abs_tol=constants.MATH_CLOSE_PREC):
            trade.amount = new_amount
            # Fee was applied, so set to 0
            trade.fee_open = 0
            trade.recalc_open_trade_price()
    except DependencyException as e:
        logger.warning("Could not update trade amount: %s", e)

    trade.open_order_id = None
    logger.info("Partial buy order timeout for %s.", trade)
    self.rpc.send_msg(
        {
            "type": RPCMessageType.STATUS_NOTIFICATION,
            "status": f"Remaining buy order for {trade.pair} cancelled due to timeout",
        }
    )
    return False