diff --git a/src/dialogs/DialogManager.cpp b/src/dialogs/DialogManager.cpp
index a412d4f..94a6a65 100644
--- a/src/dialogs/DialogManager.cpp
+++ b/src/dialogs/DialogManager.cpp
@@ -363,7 +363,7 @@ void DialogManager::raiseDeviceError(QObject *parent, QObject *msg) {
     clearMessageDialog();
     auto dialog = new GUIMessageDialog(mTopWidget);
 
-    if(mFunctionDialog->isRunning())
+    if(mFunctionDialog!= nullptr && mFunctionDialog->isRunning())
     {
         dialog->setWindowFlags(dialog->windowFlags() | Qt::WindowStaysOnTopHint | Qt::BypassWindowManagerHint );
     }