diff --git a/freqtrade/data/converter.py b/freqtrade/data/converter.py
index df2d3bdc4..c71f7795c 100644
--- a/freqtrade/data/converter.py
+++ b/freqtrade/data/converter.py
@@ -253,7 +253,7 @@ def convert_trades_format(config: Config, convert_from: str, convert_to: str, er
     logger.info(f"Converting trades for {config['pairs']}")
 
     for pair in config['pairs']:
-        data = src.trades_load(pair=pair)
+        data = src.trades_load_aslist(pair=pair)
         logger.info(f"Converting {len(data)} trades for {pair}")
         trg.trades_store(pair, data)
         if erase and convert_from != convert_to:
diff --git a/freqtrade/data/history/idatahandler.py b/freqtrade/data/history/idatahandler.py
index e822808e8..4618dfdeb 100644
--- a/freqtrade/data/history/idatahandler.py
+++ b/freqtrade/data/history/idatahandler.py
@@ -221,7 +221,7 @@ class IDataHandler(ABC):
         return trades
 
     def trades_load_aslist(self, pair: str, timerange: Optional[TimeRange] = None) -> TradeList:
-        trades = self.trades_load(pair, timerange)
+        trades = trades_remove_duplicates(self._trades_load(pair, timerange=timerange))
         return trades.values.tolist()
 
     @classmethod