diff --git a/src/gui/processing/qgsprocessingaggregatewidgetwrapper.cpp b/src/gui/processing/qgsprocessingaggregatewidgetwrapper.cpp
index 522fe86d564..d50f53bbc56 100644
--- a/src/gui/processing/qgsprocessingaggregatewidgetwrapper.cpp
+++ b/src/gui/processing/qgsprocessingaggregatewidgetwrapper.cpp
@@ -130,8 +130,8 @@ void QgsProcessingAggregatePanelWidget::setValue( const QVariant &value )
   {
     const QVariantMap map = field.toMap();
     const QgsField f( map.value( QStringLiteral( "name" ) ).toString(),
-                      static_cast< QMetaType::Type >( map.value( QStringLiteral( "type" ), QgsVariantUtils::createNullVariant( QMetaType::Type::UnknownType ) ).toInt() ),
-                      map.value( QStringLiteral( "type_name" ), QVariant::typeToName( static_cast< QMetaType::Type >( map.value( QStringLiteral( "type" ), QgsVariantUtils::createNullVariant( QMetaType::Type::UnknownType ) ).toInt() ) ) ).toString(),
+                      static_cast< QMetaType::Type >( map.value( QStringLiteral( "type" ), static_cast< int >( QMetaType::Type::UnknownType ) ).toInt() ),
+                      map.value( QStringLiteral( "type_name" ), QVariant::typeToName( static_cast< QMetaType::Type >( map.value( QStringLiteral( "type" ), static_cast< int >( QMetaType::Type::UnknownType ) ).toInt() ) ) ).toString(),
                       map.value( QStringLiteral( "length" ), 0 ).toInt(),
                       map.value( QStringLiteral( "precision" ), 0 ).toInt(),
                       QString(),
diff --git a/src/gui/processing/qgsprocessingfieldmapwidgetwrapper.cpp b/src/gui/processing/qgsprocessingfieldmapwidgetwrapper.cpp
index a05b2d8bef3..375d8baf1e6 100644
--- a/src/gui/processing/qgsprocessingfieldmapwidgetwrapper.cpp
+++ b/src/gui/processing/qgsprocessingfieldmapwidgetwrapper.cpp
@@ -133,8 +133,8 @@ void QgsProcessingFieldMapPanelWidget::setValue( const QVariant &value )
   {
     const QVariantMap map = field.toMap();
     QgsField f( map.value( QStringLiteral( "name" ) ).toString(),
-                static_cast< QMetaType::Type >( map.value( QStringLiteral( "type" ), QgsVariantUtils::createNullVariant( QMetaType::Type::UnknownType ) ).toInt() ),
-                map.value( QStringLiteral( "type_name" ), QVariant::typeToName( static_cast< QMetaType::Type >( map.value( QStringLiteral( "type" ), QgsVariantUtils::createNullVariant( QMetaType::Type::UnknownType ) ).toInt() ) ) ).toString(),
+                static_cast< QMetaType::Type >( map.value( QStringLiteral( "type" ), static_cast< int >( QMetaType::Type::UnknownType ) ).toInt() ),
+                map.value( QStringLiteral( "type_name" ), QVariant::typeToName( static_cast< QMetaType::Type >( map.value( QStringLiteral( "type" ), static_cast< int >( QMetaType::Type::UnknownType ) ).toInt() ) ) ).toString(),
                 map.value( QStringLiteral( "length" ), 0 ).toInt(),
                 map.value( QStringLiteral( "precision" ), 0 ).toInt(),
                 QString(),