diff --git a/src/app/tape/tmainwindow.cpp b/src/app/tape/tmainwindow.cpp
index 3b60b895c..57f57c10e 100644
--- a/src/app/tape/tmainwindow.cpp
+++ b/src/app/tape/tmainwindow.cpp
@@ -444,8 +444,16 @@ void TMainWindow::CreateFromExisting()
 //---------------------------------------------------------------------------------------------------------------------
 void TMainWindow::Preferences()
 {
-    TapeConfigDialog dlg(this);
-    dlg.exec();
+    // Calling constructor of the dialog take some time. Because of this user have time to call the dialog twice.
+    static QPointer<TapeConfigDialog> guard;// Prevent any second run
+    if (guard.isNull())
+    {
+        TapeConfigDialog *config = new TapeConfigDialog(this);
+        // QScopedPointer needs to be sure any exception will never block guard
+        QScopedPointer<TapeConfigDialog> dlg(config);
+        guard = config;
+        dlg->exec();
+    }
 }
 
 //---------------------------------------------------------------------------------------------------------------------
diff --git a/src/app/valentina/mainwindow.cpp b/src/app/valentina/mainwindow.cpp
index 2f678b024..b05a98995 100644
--- a/src/app/valentina/mainwindow.cpp
+++ b/src/app/valentina/mainwindow.cpp
@@ -4017,13 +4017,21 @@ void MainWindow::ShowPaper(int index)
 //---------------------------------------------------------------------------------------------------------------------
 void MainWindow::Preferences()
 {
-    ConfigDialog dlg(this);
-    connect(&dlg, &ConfigDialog::UpdateProperties, this, &MainWindow::WindowsLocale); // Must be first
-    connect(&dlg, &ConfigDialog::UpdateProperties, toolOptions, &VToolOptionsPropertyBrowser::RefreshOptions);
-    connect(&dlg, &ConfigDialog::UpdateProperties, this, &MainWindow::ToolBarStyles);
-    if (dlg.exec() == QDialog::Accepted)
+    // Calling constructor of the dialog take some time. Because of this user have time to call the dialog twice.
+    static QPointer<ConfigDialog> guard;// Prevent any second run
+    if (guard.isNull())
     {
-        InitAutoSave();
+        ConfigDialog *config = new ConfigDialog(this);
+        // QScopedPointer needs to be sure any exception will never block guard
+        QScopedPointer<ConfigDialog> dlg(config);
+        guard = config;
+        connect(dlg.data(), &ConfigDialog::UpdateProperties, this, &MainWindow::WindowsLocale); // Must be first
+        connect(dlg.data(), &ConfigDialog::UpdateProperties, toolOptions, &VToolOptionsPropertyBrowser::RefreshOptions);
+        connect(dlg.data(), &ConfigDialog::UpdateProperties, this, &MainWindow::ToolBarStyles);
+        if (guard->exec() == QDialog::Accepted)
+        {
+            InitAutoSave();
+        }
     }
 }