diff --git a/examples/vn_trader/run.py b/examples/vn_trader/run.py
index 2ac64511..c7cd65c5 100644
--- a/examples/vn_trader/run.py
+++ b/examples/vn_trader/run.py
@@ -11,7 +11,7 @@ from vnpy.gateway.ctp import CtpGateway
 # from vnpy.gateway.ctptest import CtptestGateway
 from vnpy.gateway.femas import FemasGateway
 from vnpy.gateway.tiger import TigerGateway
-from vnpy.gateway.oes import OesGateway
+# from vnpy.gateway.oes import OesGateway
 from vnpy.gateway.okex import OkexGateway
 from vnpy.gateway.huobi import HuobiGateway
 from vnpy.gateway.bitfinex import BitfinexGateway
@@ -19,7 +19,7 @@ from vnpy.gateway.onetoken import OnetokenGateway
 from vnpy.gateway.okexf import OkexfGateway
 # from vnpy.gateway.xtp import XtpGateway
 from vnpy.gateway.hbdm import HbdmGateway
-# from vnpy.gateway.tap import TapGateway
+from vnpy.gateway.tap import TapGateway
 
 from vnpy.app.cta_strategy import CtaStrategyApp
 from vnpy.app.csv_loader import CsvLoaderApp
@@ -45,7 +45,7 @@ def main():
     main_engine.add_gateway(FutuGateway)
     main_engine.add_gateway(BitmexGateway)
     main_engine.add_gateway(TigerGateway)
-    main_engine.add_gateway(OesGateway)
+    # main_engine.add_gateway(OesGateway)
     main_engine.add_gateway(OkexGateway)
     main_engine.add_gateway(HuobiGateway)
     main_engine.add_gateway(BitfinexGateway)
@@ -53,7 +53,7 @@ def main():
     main_engine.add_gateway(OkexfGateway)
     main_engine.add_gateway(HbdmGateway)
     # main_engine.add_gateway(XtpGateway)
-    # main_engine.add_gateway(TapGateway)
+    main_engine.add_gateway(TapGateway)
 
     main_engine.add_app(CtaStrategyApp)
     main_engine.add_app(CtaBacktesterApp)
diff --git a/vnpy/gateway/tap/tap_gateway.py b/vnpy/gateway/tap/tap_gateway.py
index 9a348787..7ba6ed99 100644
--- a/vnpy/gateway/tap/tap_gateway.py
+++ b/vnpy/gateway/tap/tap_gateway.py
@@ -336,9 +336,10 @@ class QuoteApi(ITapQuoteAPINotify):
         """
         Release TAP API resources.
         """
-        self.api.SetAPINotify(None)
-        FreeTapQuoteAPI(self.api)
-        self.api = None
+        if self.api:
+            self.api.SetAPINotify(None)
+            FreeTapQuoteAPI(self.api)
+            self.api = None
 
     def subscribe(self, req: SubscribeRequest):
         """
@@ -813,9 +814,10 @@ class TradeApi(ITapTradeAPINotify):
         """
         Release TAP API resources.
         """
-        self.api.SetAPINotify(None)
-        FreeITapTradeAPI(self.api)
-        self.api = None
+        if self.api:
+            self.api.SetAPINotify(None)
+            FreeITapTradeAPI(self.api)
+            self.api = None
 
 
 def parse_datetime(dt_str: str):