diff --git a/src/ATBAPP/DeviceControllerDiag.cpp b/src/ATBAPP/DeviceControllerDiag.cpp
index 7778813..7de2550 100644
--- a/src/ATBAPP/DeviceControllerDiag.cpp
+++ b/src/ATBAPP/DeviceControllerDiag.cpp
@@ -61,6 +61,7 @@ void DeviceControllerDiag::diagRequest()
         qCritical() << "DeviceControllerDiag::diagRequest() is already running";
         return;
     }
+    this->machineEventSet.clear();
     this->isRequestRunning = true;
     this->diagRequestTimeoutTimer->start();
 
@@ -452,12 +453,12 @@ void DeviceControllerDiag::sub_componentAssessment()
     this->flagInterruptDiag = false;
 
     this->previousMachineEventSet = machineEventSet;
-    this->machineEventSet.clear();
 
     if (this->isDiagBackgroundTask) {
         this->isDiagBackgroundTask = false;
         this->dbus->finishedBackgroundTask("E255");
     }
+
 }