diff --git a/freqtrade/data/btanalysis.py b/freqtrade/data/btanalysis.py
index f2356c34b..5865d56a7 100644
--- a/freqtrade/data/btanalysis.py
+++ b/freqtrade/data/btanalysis.py
@@ -30,7 +30,7 @@ def load_backtest_data(filename) -> pd.DataFrame:
         filename = Path(filename)
 
     if not filename.is_file():
-        raise ValueError("File {filename} does not exist.")
+        raise ValueError(f"File {filename} does not exist.")
 
     with filename.open() as file:
         data = json_load(file)
diff --git a/freqtrade/optimize/hyperopt.py b/freqtrade/optimize/hyperopt.py
index 1d4a1f2b8..93dfa5102 100644
--- a/freqtrade/optimize/hyperopt.py
+++ b/freqtrade/optimize/hyperopt.py
@@ -78,6 +78,12 @@ class Hyperopt(Backtesting):
             self.max_open_trades = 0
         self.position_stacking = self.config.get('position_stacking', False),
 
+        if self.has_space('sell'):
+            # Make sure experimental is enabled
+            if 'experimental' not in self.config:
+                self.config['experimental'] = {}
+            self.config['experimental']['use_sell_signal'] = True
+
     @staticmethod
     def get_lock_filename(config) -> str:
 
@@ -129,13 +135,14 @@ class Hyperopt(Backtesting):
         """
         results = sorted(self.trials, key=itemgetter('loss'))
         best_result = results[0]
+        params = best_result['params']
 
         log_str = self.format_results_logstring(best_result)
         print(f"\nBest result:\n{log_str}\nwith values:")
-        pprint(best_result['params'], indent=4)
-        if 'roi_t1' in best_result['params']:
+        pprint(params, indent=4)
+        if self.has_space('roi'):
             print("ROI table:")
-            pprint(self.custom_hyperopt.generate_roi_table(best_result['params']), indent=4)
+            pprint(self.custom_hyperopt.generate_roi_table(params), indent=4)
 
     def log_results(self, results) -> None:
         """
@@ -167,9 +174,7 @@ class Hyperopt(Backtesting):
         """
         Tell if a space value is contained in the configuration
         """
-        if space in self.config['spaces'] or 'all' in self.config['spaces']:
-            return True
-        return False
+        return any(s in self.config['spaces'] for s in [space, 'all'])
 
     def hyperopt_space(self) -> List[Dimension]:
         """
@@ -177,16 +182,16 @@ class Hyperopt(Backtesting):
         """
         spaces: List[Dimension] = []
         if self.has_space('buy'):
+            logger.debug("Hyperopt has 'buy' space")
             spaces += self.custom_hyperopt.indicator_space()
         if self.has_space('sell'):
+            logger.debug("Hyperopt has 'sell' space")
             spaces += self.custom_hyperopt.sell_indicator_space()
-            # Make sure experimental is enabled
-            if 'experimental' not in self.config:
-                self.config['experimental'] = {}
-            self.config['experimental']['use_sell_signal'] = True
         if self.has_space('roi'):
+            logger.debug("Hyperopt has 'roi' space")
             spaces += self.custom_hyperopt.roi_space()
         if self.has_space('stoploss'):
+            logger.debug("Hyperopt has 'stoploss' space")
             spaces += self.custom_hyperopt.stoploss_space()
         return spaces
 
diff --git a/freqtrade/tests/optimize/test_hyperopt.py b/freqtrade/tests/optimize/test_hyperopt.py
index d1341ec6f..8bc0f6695 100644
--- a/freqtrade/tests/optimize/test_hyperopt.py
+++ b/freqtrade/tests/optimize/test_hyperopt.py
@@ -26,6 +26,7 @@ from freqtrade.tests.conftest import (get_args, log_has, log_has_re,
 
 @pytest.fixture(scope='function')
 def hyperopt(default_conf, mocker):
+    default_conf.update({'spaces': ['all']})
     patch_exchange(mocker)
     return Hyperopt(default_conf)
 
@@ -458,6 +459,7 @@ def test_start_calls_optimizer(mocker, default_conf, caplog, capsys) -> None:
 
     hyperopt = Hyperopt(default_conf)
     hyperopt.strategy.tickerdata_to_dataframe = MagicMock()
+    hyperopt.custom_hyperopt.generate_roi_table = MagicMock(return_value={})
 
     hyperopt.start()