diff --git a/src/ATBAPP/ATBMachineEvent.h b/src/ATBAPP/ATBMachineEvent.h
index d041ae1..4c74016 100644
--- a/src/ATBAPP/ATBMachineEvent.h
+++ b/src/ATBAPP/ATBMachineEvent.h
@@ -15,7 +15,7 @@ class ATBMachineEvent : public QEvent
 public:
     explicit ATBMachineEvent(const QString & id,
                 const QString & deviceName,              // PTU/PRINTER/DC/...
-                EVENT_CLASS eventClass,          // reason of event: Error/Warning/Alarm
+                EVENT_CLASS eventClass,                  // reason of event: Error/Warning/Alarm
                 const QString & name,                    // 'Event': "E001", "W003"
                 const int state,
                 const QString & parameter,
diff --git a/src/ATBAPP/DeviceControllerDiag.cpp b/src/ATBAPP/DeviceControllerDiag.cpp
index b367afa..e781fad 100644
--- a/src/ATBAPP/DeviceControllerDiag.cpp
+++ b/src/ATBAPP/DeviceControllerDiag.cpp
@@ -506,10 +506,8 @@ void DeviceControllerDiag::private_sendDiagEvent(DeviceController::State result)
         parameter  = "no valid data from DeviceController";
         break;
     case DeviceController::State::E255:   // no valid data from DeviceController
-        eventClass = EVENT_CLASS::STATE;
-        parameter  = "";
-        qCritical() << "       ... ignore " << QMetaEnum::fromType<DeviceController::State>().valueToKey(result);
-        return;
+        eventClass = EVENT_CLASS::ERROR;
+        parameter  = "no valid data from DeviceController";
         break;
     case DeviceController::State::O000:   // everything is fine
         this->machineEventSet.clear();