diff --git a/m2wsgi/device/dispatcher.py b/m2wsgi/device/dispatcher.py
index fb00073..40e8f31 100644
--- a/m2wsgi/device/dispatcher.py
+++ b/m2wsgi/device/dispatcher.py
@@ -560,7 +560,10 @@ def add_active_handler(self,handler):
         self.active_handlers.add_target(handler)
 
     def rem_active_handler(self,handler):
-        self.active_handlers.rem_target(handler)
+        try:
+            self.active_handlers.rem_target(handler)
+        except (KeyError,):
+            pass
 
     def is_active_handler(self,handler):
         return self.active_handlers.has_target(handler)