# Buggy code
def start_hyperopt_show(args: Dict[str, Any]) -> None:
    """
    Show details of a hyperopt epoch previously evaluated
    """
    from freqtrade.optimize.hyperopt import Hyperopt

    config = setup_utils_configuration(args, RunMode.UTIL_NO_EXCHANGE)

    only_best = config.get("hyperopt_list_best", False)
    only_profitable = config.get("hyperopt_list_profitable", False)
    no_header = config.get("hyperopt_show_no_header", False)

    trials_file = (
        config["user_data_dir"] / "hyperopt_results" / "hyperopt_results.pickle"
    )

    # Previous evaluations
    trials = Hyperopt.load_previous_results(trials_file)
    total_epochs = len(trials)

    trials = _hyperopt_filter_trials(trials, only_best, only_profitable)
    trials_epochs = len(trials)

    n = config.get("hyperopt_show_index", -1)
    if n > trials_epochs:
        raise OperationalException(
            f"The index of the epoch to show should be less than {trials_epochs + 1}."
        )
    if n < -trials_epochs:
        raise OperationalException(
            f"The index of the epoch to show should be greater than {-trials_epochs - 1}."
        )

    # Translate epoch index from human-readable format to pythonic
    if n > 0:
        n -= 1

    print_json = config.get("print_json", False)

    if trials:
        val = trials[n]
        Hyperopt.print_epoch_details(
            val, total_epochs, print_json, no_header, header_str="Epoch details"
        )


# 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 start_hyperopt_show(args: Dict[str, Any]) -> None:
    """
    Show details of a hyperopt epoch previously evaluated
    """
    from freqtrade.optimize.hyperopt import Hyperopt

    config = setup_utils_configuration(args, RunMode.UTIL_NO_EXCHANGE)

    filteroptions = {
        "only_best": config.get("hyperopt_list_best", False),
        "only_profitable": config.get("hyperopt_list_profitable", False),
        "filter_min_trades": config.get("hyperopt_list_min_trades", 0),
        "filter_max_trades": config.get("hyperopt_list_max_trades", 0),
        "filter_min_avg_time": config.get("hyperopt_list_min_avg_time", None),
        "filter_max_avg_time": config.get("hyperopt_list_max_avg_time", None),
        "filter_min_avg_profit": config.get("hyperopt_list_min_avg_profit", None),
        "filter_max_avg_profit": config.get("hyperopt_list_max_avg_profit", None),
        "filter_min_total_profit": config.get("hyperopt_list_min_total_profit", None),
        "filter_max_total_profit": config.get("hyperopt_list_max_total_profit", None),
    }
    no_header = config.get("hyperopt_show_no_header", False)

    trials_file = (
        config["user_data_dir"] / "hyperopt_results" / "hyperopt_results.pickle"
    )

    # Previous evaluations
    trials = Hyperopt.load_previous_results(trials_file)
    total_epochs = len(trials)

    trials = _hyperopt_filter_trials(trials, filteroptions)
    trials_epochs = len(trials)

    n = config.get("hyperopt_show_index", -1)
    if n > trials_epochs:
        raise OperationalException(
            f"The index of the epoch to show should be less than {trials_epochs + 1}."
        )
    if n < -trials_epochs:
        raise OperationalException(
            f"The index of the epoch to show should be greater than {-trials_epochs - 1}."
        )

    # Translate epoch index from human-readable format to pythonic
    if n > 0:
        n -= 1

    print_json = config.get("print_json", False)

    if trials:
        val = trials[n]
        Hyperopt.print_epoch_details(
            val, total_epochs, print_json, no_header, header_str="Epoch details"
        )