[Fix] close #2187

vnpy/app/spread_trading/strategies/statistical_arbitrage_strategy.py

@@ -94,6 +94,8 @@ class StatisticalArbitrageStrategy(SpreadStrategyTemplate):
         """
         Callback when spread bar data is generated.
         """
+        self.stop_all_algos()
+
         self.am.update_bar(bar)
         if not self.am.inited:
             return

vnpy/app/spread_trading/template.py

@@ -547,7 +547,7 @@ class SpreadStrategyTemplate:
 
     def stop_all_algos(self):
         """"""
-        for algoid in self.algoids:
+        for algoid in list(self.algoids):
             self.stop_algo(algoid)
 
     def buy(self, vt_symbol: str, price: float, volume: float, lock: bool = False) -> List[str]: