It is a good idea to initialize pointer members in the ctor.

src/libcalamaresui/utils/PluginFactory_p.h

@@ -36,10 +36,11 @@ class PluginFactoryPrivate
 protected:
     typedef QPair<const QMetaObject *, PluginFactory::CreateInstanceFunction> Plugin;
 
-    PluginFactoryPrivate() : catalogInitialized(false) {}
+    PluginFactoryPrivate()
-    ~PluginFactoryPrivate()
+        : catalogInitialized( false )
-    {
+        , q_ptr( nullptr )
-    }
+    {}
+    ~PluginFactoryPrivate() {}
 
     QHash<QString, Plugin> createInstanceHash;
     QString catalogName;