diff --git a/base.py b/base.py
index 6769d7c..de5e51c 100644
--- a/base.py
+++ b/base.py
@@ -237,7 +237,10 @@ class ServiceManager:
             for p in procs.get(ins, {}).get(service, []):
                 print_wait = True
                 for action in ('terminate', 'kill'):
-                    getattr(p, action)()  # p.terminate or p.kill
+                    try:
+                        getattr(p, action)()  # p.terminate or p.kill
+                    except psutil.NoSuchProcess:
+                        continue  # already killed
                     for i in range(10):  # total 0.1 * 10 * 9 / 2 = 4.5 sec
                         try:
                             p.wait(0.1 * i)
@@ -261,6 +264,8 @@ class ServiceManager:
 
     def do_stop(self, ins, service=None, *args):
         self.get_info()
+        if ins is None:
+            raise ValueError('use stop all if you really want to stop all')
         ins_list = self.wildcard(ins)
         if ins_list is not None:
             return ins_list