diff --git a/src/audio/rtmidi.cpp b/src/audio/rtmidi.cpp
index cbf4dca42..ea1903c36 100644
--- a/src/audio/rtmidi.cpp
+++ b/src/audio/rtmidi.cpp
@@ -160,6 +160,7 @@ bool TAMidiInRtMidi::quit() {
 
 bool TAMidiOutRtMidi::send(const TAMidiMessage& what) {
   if (!isOpen) return false;
+  if (!isWorking) return false;
   if (what.type<0x80) return false;
   size_t len=0;
   switch (what.type&0xf0) {
@@ -190,6 +191,7 @@ bool TAMidiOutRtMidi::send(const TAMidiMessage& what) {
         port->sendMessage(what.sysExData.get(),len);
       } catch (RtMidiError& e) {
         logE("MIDI output error! %s",e.what());
+        isWorking=false;
         return false;
       }
       return true;
@@ -209,6 +211,7 @@ bool TAMidiOutRtMidi::send(const TAMidiMessage& what) {
     port->sendMessage((const unsigned char*)&what.type,len);
   } catch (RtMidiError& e) {
     logE("MIDI output error! %s",e.what());
+    isWorking=false;
     return false;
   }
   return true;
@@ -237,17 +240,20 @@ bool TAMidiOutRtMidi::openDevice(String name) {
     }
     isOpen=portOpen;
     if (!portOpen) logW("could not find MIDI out device...");
+    isWorking=true;
     return portOpen;
   } catch (RtMidiError& e) {
     logW("could not open MIDI out device! %s",e.what());
     return false;
   }
+  isWorking=true;
   return true;
 }
 
 bool TAMidiOutRtMidi::closeDevice() {
   if (port==NULL) return false;
   if (!isOpen) return false;
+  isWorking=false;
   try {
     port->closePort();
   } catch (RtMidiError& e) {
diff --git a/src/audio/rtmidi.h b/src/audio/rtmidi.h
index 5a8e06e0b..33a71af56 100644
--- a/src/audio/rtmidi.h
+++ b/src/audio/rtmidi.h
@@ -38,7 +38,7 @@ class TAMidiInRtMidi: public TAMidiIn {
 
 class TAMidiOutRtMidi: public TAMidiOut {
   RtMidiOut* port;
-  bool isOpen;
+  bool isOpen, isWorking;
   public:
     bool send(const TAMidiMessage& what);
     bool isDeviceOpen();
@@ -49,5 +49,6 @@ class TAMidiOutRtMidi: public TAMidiOut {
     bool init();
     TAMidiOutRtMidi():
       port(NULL),
-      isOpen(false) {}
+      isOpen(false),
+      isWorking(false) {}
 };
\ No newline at end of file