diff --git a/freqtrade/strategy/interface.py b/freqtrade/strategy/interface.py
index cbe6afc26..651ca14bf 100644
--- a/freqtrade/strategy/interface.py
+++ b/freqtrade/strategy/interface.py
@@ -1006,7 +1006,7 @@ class IStrategy(ABC, HyperStrategyMixin):
             exit_ = latest.get(SignalType.EXIT_LONG.value, 0) == 1
         exit_tag = latest.get(SignalTagType.EXIT_TAG.value, None)
         # Tags can be None, which does not resolve to False.
-        exit_tag = exit_tag if isinstance(exit_tag, str) else None
+        exit_tag = exit_tag if isinstance(exit_tag, str) and exit_tag != 'nan' else None
 
         logger.debug(f"exit-trigger: {latest['date']} (pair={pair}) "
                      f"enter={enter} exit={exit_}")
@@ -1038,17 +1038,17 @@ class IStrategy(ABC, HyperStrategyMixin):
         exit_short = latest.get(SignalType.EXIT_SHORT.value, 0) == 1
 
         enter_signal: Optional[SignalDirection] = None
-        enter_tag_value: Optional[str] = None
+        enter_tag: Optional[str] = None
         if enter_long == 1 and not any([exit_long, enter_short]):
             enter_signal = SignalDirection.LONG
-            enter_tag_value = latest.get(SignalTagType.ENTER_TAG.value, None)
+            enter_tag = latest.get(SignalTagType.ENTER_TAG.value, None)
         if (self.config.get('trading_mode', TradingMode.SPOT) != TradingMode.SPOT
                 and self.can_short
                 and enter_short == 1 and not any([exit_short, enter_long])):
             enter_signal = SignalDirection.SHORT
-            enter_tag_value = latest.get(SignalTagType.ENTER_TAG.value, None)
+            enter_tag = latest.get(SignalTagType.ENTER_TAG.value, None)
 
-        enter_tag_value = enter_tag_value if isinstance(enter_tag_value, str) else None
+        enter_tag = enter_tag if isinstance(enter_tag, str) and enter_tag != 'nan' else None
 
         timeframe_seconds = timeframe_to_seconds(timeframe)
 
@@ -1058,11 +1058,11 @@ class IStrategy(ABC, HyperStrategyMixin):
             timeframe_seconds=timeframe_seconds,
             enter=bool(enter_signal)
         ):
-            return None, enter_tag_value
+            return None, enter_tag
 
         logger.debug(f"entry trigger: {latest['date']} (pair={pair}) "
-                     f"enter={enter_long} enter_tag_value={enter_tag_value}")
-        return enter_signal, enter_tag_value
+                     f"enter={enter_long} enter_tag_value={enter_tag}")
+        return enter_signal, enter_tag
 
     def ignore_expired_candle(
         self,