diff --git a/clientgui/BOINCGUIApp.cpp b/clientgui/BOINCGUIApp.cpp
index 3cb9a11dcb..c3e869a580 100644
--- a/clientgui/BOINCGUIApp.cpp
+++ b/clientgui/BOINCGUIApp.cpp
@@ -519,6 +519,7 @@ int CBOINCGUIApp::OnExit() {
 
     if (m_pSkinManager) {
         delete m_pSkinManager;
+        m_pSkinManager = NULL;
     }
 
     if (m_pLocale) {