# Buggy code
def update_trade_state(self, trade, action_order: dict = None):
    """
    Checks trades with open orders and updates the amount if necessary
    """
    # Get order details for actual price per unit
    if trade.open_order_id:
        # Update trade with order values
        logger.info("Found open order for %s", trade)
        try:
            order = action_order or self.exchange.get_order(
                trade.open_order_id, trade.pair
            )
        except InvalidOrderException as exception:
            logger.warning(
                "Unable to fetch order %s: %s", trade.open_order_id, exception
            )
            return
        # Try update amount (binance-fix)
        try:
            new_amount = self.get_real_amount(trade, order)
            if not isclose(
                order["amount"], new_amount, abs_tol=constants.MATH_CLOSE_PREC
            ):
                order["amount"] = new_amount
                # Fee was applied, so set to 0
                trade.fee_open = 0
                trade.recalc_open_trade_price()

        except DependencyException as exception:
            logger.warning("Could not update trade amount: %s", exception)

        trade.update(order)

        # Updating wallets when order is closed
        if not trade.is_open:
            self.wallets.update()


# 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 update_trade_state(self, trade: Trade, action_order: dict = None) -> None:
    """
    Checks trades with open orders and updates the amount if necessary
    """
    # Get order details for actual price per unit
    if trade.open_order_id:
        # Update trade with order values
        logger.info("Found open order for %s", trade)
        try:
            order = action_order or self.exchange.get_order(
                trade.open_order_id, trade.pair
            )
        except InvalidOrderException as exception:
            logger.warning(
                "Unable to fetch order %s: %s", trade.open_order_id, exception
            )
            return
        # Try update amount (binance-fix)
        try:
            new_amount = self.get_real_amount(trade, order)
            if not isclose(
                order["amount"], new_amount, abs_tol=constants.MATH_CLOSE_PREC
            ):
                order["amount"] = new_amount
                # Fee was applied, so set to 0
                trade.fee_open = 0
                trade.recalc_open_trade_price()

        except DependencyException as exception:
            logger.warning("Could not update trade amount: %s", exception)

        trade.update(order)

        # Updating wallets when order is closed
        if not trade.is_open:
            self.wallets.update()