diff --git a/mopidy/session.py b/mopidy/session.py
index e588b9fd..755bde02 100644
--- a/mopidy/session.py
+++ b/mopidy/session.py
@@ -37,8 +37,12 @@ class MpdSession(asynchat.async_chat):
         self.handle_request(input)
 
     def handle_request(self, input):
-        response = self.handler.handle_request(input)
-        self.handle_response(response)
+        try:
+            response = self.handler.handle_request(input)
+            self.handle_response(response)
+        except MpdAckError, e:
+            logger.warning(e)
+            return self.send_response(u'ACK %s' % e)
 
     def handle_response(self, response):
         for line in response: