Use helper-method to modify trades_open

freqtrade/optimize/backtesting.py

@@ -1125,7 +1125,7 @@ class Backtesting:
                         open_trade_count -= 1
                         open_trade_count_start -= 1
                         open_trades[pair].remove(t)
-                        LocalTrade.trades_open.remove(t)
+                        LocalTrade.remove_bt_trade(t)
                         self.wallets.update()
 
                 # 2. Process entries.

freqtrade/persistence/trade_model.py

@@ -1077,6 +1077,10 @@ class LocalTrade():
         else:
             LocalTrade.trades.append(trade)
 
+    @staticmethod
+    def remove_bt_trade(trade):
+        LocalTrade.trades_open.remove(trade)
+
     @staticmethod
     def get_open_trades() -> List[Any]:
         """