diff --git a/o_manager.py b/o_manager.py
index fede877..45112f7 100644
--- a/o_manager.py
+++ b/o_manager.py
@@ -86,13 +86,15 @@ class OManager:
             print("kill failed:", err)
         for task in self.run_task:
             task.cancel()
+        self.pids = []
         self.run_task = []
         lb_cfg_fp = self.generate_lb_cfg()
-        lb_cmd = ["go-socks-lb/go-socks-lb", "-config",
-                           lb_cfg_fp, "-bind", "0.0.0.0:7000"]
-        print("lb_cmd", lb_cmd)
-        self.run_task.append(self.loop.create_task(
-            self.run_cmd(lb_cmd)))
+        if len(self.running_idx):
+            lb_cmd = ["go-socks-lb/go-socks-lb", "-config",
+                              lb_cfg_fp, "-bind", "0.0.0.0:7000"]
+            print("lb_cmd", lb_cmd)
+            self.run_task.append(self.loop.create_task(
+                self.run_cmd(lb_cmd)))
 
     async def run_cmd(self, cmd):
         while True: