diff --git a/kcmkwin/kwindecoration/declarative-plugin/plugin.cpp b/kcmkwin/kwindecoration/declarative-plugin/plugin.cpp
--- a/kcmkwin/kwindecoration/declarative-plugin/plugin.cpp
+++ b/kcmkwin/kwindecoration/declarative-plugin/plugin.cpp
@@ -41,10 +41,17 @@
     qmlRegisterType<KDecoration2::Preview::PreviewItem>(uri, 1, 0, "Decoration");
     qmlRegisterType<KDecoration2::Preview::PreviewButtonItem>(uri, 1, 0, "Button");
     qmlRegisterType<KDecoration2::Preview::ButtonsModel>(uri, 1, 0, "ButtonsModel");
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
     qmlRegisterType<KDecoration2::Preview::PreviewClient>();
     qmlRegisterType<KDecoration2::Decoration>();
     qmlRegisterType<KDecoration2::DecorationShadow>();
     qmlRegisterType<KDecoration2::Preview::PreviewBridge>();
+#else
+    qmlRegisterAnonymousType<KDecoration2::Preview::PreviewClient>(uri, 1);
+    qmlRegisterAnonymousType<KDecoration2::Decoration>(uri, 1);
+    qmlRegisterAnonymousType<KDecoration2::DecorationShadow>(uri, 1);
+    qmlRegisterAnonymousType<KDecoration2::Preview::PreviewBridge>(uri, 1);
+#endif
 }
 
 }
diff --git a/kcmkwin/kwindecoration/kcm.cpp b/kcmkwin/kwindecoration/kcm.cpp
--- a/kcmkwin/kwindecoration/kcm.cpp
+++ b/kcmkwin/kwindecoration/kcm.cpp
@@ -100,10 +100,13 @@
                      i18n("Author"),
                      QStringLiteral("vpilo@coldshock.net"));
     setAboutData(about);
-
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
     qmlRegisterType<QAbstractListModel>();
     qmlRegisterType<QSortFilterProxyModel>();
-
+#else
+    qmlRegisterAnonymousType<QAbstractListModel>("org.kde.kwin.KWinDecoration", 1);
+    qmlRegisterAnonymousType<QSortFilterProxyModel>("org.kde.kwin.KWinDecoration", 1);
+#endif
     m_proxyThemesModel->setSourceModel(m_themesModel);
     m_proxyThemesModel->setFilterCaseSensitivity(Qt::CaseInsensitive);
     m_proxyThemesModel->setSortCaseSensitivity(Qt::CaseInsensitive);
diff --git a/plugins/kdecorations/aurorae/src/decorationoptions.cpp b/plugins/kdecorations/aurorae/src/decorationoptions.cpp
--- a/plugins/kdecorations/aurorae/src/decorationoptions.cpp
+++ b/plugins/kdecorations/aurorae/src/decorationoptions.cpp
@@ -167,16 +167,16 @@
     }
     if (m_decoration) {
         // disconnect from existing decoration
-        disconnect(m_decoration->client().data(), &KDecoration2::DecoratedClient::activeChanged, this, &DecorationOptions::slotActiveChanged);
+        disconnect(m_decoration->client().toStrongRef().data(), &KDecoration2::DecoratedClient::activeChanged, this, &DecorationOptions::slotActiveChanged);
         auto s = m_decoration->settings();
         disconnect(s.data(), &KDecoration2::DecorationSettings::fontChanged, this, &DecorationOptions::fontChanged);
         disconnect(s.data(), &KDecoration2::DecorationSettings::decorationButtonsLeftChanged, this, &DecorationOptions::titleButtonsChanged);
         disconnect(s.data(), &KDecoration2::DecorationSettings::decorationButtonsRightChanged, this, &DecorationOptions::titleButtonsChanged);
         disconnect(m_paletteConnection);
     }
     m_decoration = decoration;
-    connect(m_decoration->client().data(), &KDecoration2::DecoratedClient::activeChanged, this, &DecorationOptions::slotActiveChanged);
-    m_paletteConnection = connect(m_decoration->client().data(), &KDecoration2::DecoratedClient::paletteChanged, this,
+    connect(m_decoration->client().toStrongRef().data(), &KDecoration2::DecoratedClient::activeChanged, this, &DecorationOptions::slotActiveChanged);
+    m_paletteConnection = connect(m_decoration->client().toStrongRef().data(), &KDecoration2::DecoratedClient::paletteChanged, this,
         [this] (const QPalette &pal) {
             m_colors.update(pal);
             emit colorsChanged();
@@ -194,10 +194,10 @@
     if (!m_decoration) {
         return;
     }
-    if (m_active == m_decoration->client().data()->isActive()) {
+    if (m_active == m_decoration->client().toStrongRef().data()->isActive()) {
         return;
     }
-    m_active = m_decoration->client().data()->isActive();
+    m_active = m_decoration->client().toStrongRef().data()->isActive();
     emit colorsChanged();
     emit fontChanged();
 }
diff --git a/screenedge.cpp b/screenedge.cpp
--- a/screenedge.cpp
+++ b/screenedge.cpp
@@ -880,7 +880,7 @@
 void ScreenEdges::updateLayout()
 {
     const QSize desktopMatrix = VirtualDesktopManager::self()->grid().size();
-    Qt::Orientations newLayout = nullptr;
+    Qt::Orientations newLayout = {};
     if (desktopMatrix.width() > 1) {
         newLayout |= Qt::Horizontal;
     }