diff --git a/python/plugins/processing/modeler/ModelerParametersDialog.py b/python/plugins/processing/modeler/ModelerParametersDialog.py
index e179652d63f9..eaedee37748b 100644
--- a/python/plugins/processing/modeler/ModelerParametersDialog.py
+++ b/python/plugins/processing/modeler/ModelerParametersDialog.py
@@ -72,7 +72,7 @@ def __init__(self, alg, model, algName=None, configuration=None):
         self.configuration = configuration
         self.context = createContext()
 
-        self.setWindowTitle(' - '.join([self._alg.group(), self._alg.displayName()]))
+        self.setWindowTitle(' - '.join([self._alg.group(), self._alg.displayName()]) if self._alg.group() else self._alg.displayName())
 
         self.widget = ModelerParametersWidget(alg, model, algName, configuration, context=self.context, dialog=self)
         QgsGui.enableAutoGeometryRestore(self)
diff --git a/src/gui/processing/qgsprocessingalgorithmdialogbase.cpp b/src/gui/processing/qgsprocessingalgorithmdialogbase.cpp
index 64a3e3ca015b..2fdf1ce19147 100644
--- a/src/gui/processing/qgsprocessingalgorithmdialogbase.cpp
+++ b/src/gui/processing/qgsprocessingalgorithmdialogbase.cpp
@@ -333,11 +333,15 @@ void QgsProcessingAlgorithmDialogBase::setAlgorithm( QgsProcessingAlgorithm *alg
   QString title;
   if ( ( QgsGui::higFlags() & QgsGui::HigDialogTitleIsTitleCase ) && !( algorithm->flags() & Qgis::ProcessingAlgorithmFlag::DisplayNameIsLiteral ) )
   {
-    title = QStringLiteral( "%1 - %2" ).arg( QgsStringUtils::capitalize( mAlgorithm->group(), Qgis::Capitalization::TitleCase ), QgsStringUtils::capitalize( mAlgorithm->displayName(), Qgis::Capitalization::TitleCase ) );
+    title = mAlgorithm->group().isEmpty()
+            ? QgsStringUtils::capitalize( mAlgorithm->displayName(), Qgis::Capitalization::TitleCase )
+            : QStringLiteral( "%1 - %2" ).arg( QgsStringUtils::capitalize( mAlgorithm->group(), Qgis::Capitalization::TitleCase ), QgsStringUtils::capitalize( mAlgorithm->displayName(), Qgis::Capitalization::TitleCase ) );
   }
   else
   {
-    title = QStringLiteral( "%1 - %2" ).arg( mAlgorithm->group(), mAlgorithm->displayName() );
+    title = mAlgorithm->group().isEmpty()
+            ? mAlgorithm->displayName()
+            : QStringLiteral( "%1 - %2" ).arg( mAlgorithm->group(), mAlgorithm->displayName() );
   }
 
   setWindowTitle( title );