diff --git a/lib/python/spontini_server_core.py b/lib/python/spontini_server_core.py
index 49a7a4a..5e16e98 100644
--- a/lib/python/spontini_server_core.py
+++ b/lib/python/spontini_server_core.py
@@ -834,6 +834,14 @@ def doPostSync(message, request):
       log(clientInfo + traceback.format_exc(), "E")
       return sendCompleteResponse("KO", traceback.format_exc().encode("utf8"))
 
+  if message['cmd'] == 'LOG':
+    if not checkMsgStructure(message, 2):
+      return sendMalformedMsgResponse()
+    text = message['param1']
+    level = message['param2']
+    log(clientInfo + text, level)
+    return sendCompleteResponse("OK", "")
+
   if message['cmd'] == 'EXEC_PLUGIN':
     if not checkMsgStructure(message, 5):
       return sendMalformedMsgResponse()
diff --git a/lib/webgui/js/midi-functions.js b/lib/webgui/js/midi-functions.js
index 8da7d76..0952bd6 100644
--- a/lib/webgui/js/midi-functions.js
+++ b/lib/webgui/js/midi-functions.js
@@ -226,7 +226,11 @@ function turnOnMidiInputAndListenOnChannel(channel) {
   WebMidi
     .enable()
     .then(onEnabled)
-    .catch(err => alert(err));
+    .catch(err => {
+      console.error(err)
+      sendMsgToSpontiniServer({ cmd: 'LOG', param1: "[MIDI input] " +
+                                err.toString(), param2: 'E' }, function(statusTxt, responseTxt) {})
+    });
 
   // Function triggered when WebMidi.js is ready
   function onEnabled() {