diff --git a/resources/lib/companion.py b/resources/lib/companion.py
index 9733acce..1373b162 100644
--- a/resources/lib/companion.py
+++ b/resources/lib/companion.py
@@ -115,6 +115,8 @@ def process_command(request_path, params, queue=None):
             volume = int(params['volume'])
             log.debug("Adjusting the volume to %s" % volume)
             JSONRPC('Application.SetVolume').execute({"volume": volume})
+        else:
+            log.error('Unknown parameters: %s' % params)
 
     elif request_path == "player/playback/play":
         for playerid in getPlayerIds():