diff --git a/Application.cpp b/Application.cpp
index 372d7c8..754b91e 100644
--- a/Application.cpp
+++ b/Application.cpp
@@ -56,7 +56,7 @@ PartInstance* Application::makePart()
 
 void Application::setFocus(bool focus)
 {
-	if(_propWindow->_hwndProp != NULL)
+	if(_propWindow != NULL && _propWindow->_hwndProp != NULL)
 		if(focus)
 		{
 			ShowWindow(_propWindow->_hwndProp, SW_SHOW);