don't delete the kns3 dialog on application shutdown

BUG:288153

private/packages.cpp

@@ -22,6 +22,7 @@
 #include <math.h>
 #include <float.h> // FLT_MAX
 
+#include <QCoreApplication>
 #include <QFileInfo>
 
 #include <kconfiggroup.h>
@@ -82,7 +83,10 @@ PlasmoidPackage::PlasmoidPackage(QObject *parent)
 PlasmoidPackage::~PlasmoidPackage()
 {
 #ifndef PLASMA_NO_KNEWSTUFF
+    if (!QCoreApplication::closingDown()) {
+        // let it "leak" on application close as this causes crashes otherwise, BUG 288153
         delete m_knsDialog.data();
+    }
 #endif
 }