diff --git a/src/app-manager.c b/src/app-manager.c
index 5092e00..ac5c84b 100644
--- a/src/app-manager.c
+++ b/src/app-manager.c
@@ -97,12 +97,20 @@ static GPid
 app_get_pid(WnckApplication *application)
 {
 	GPid pid;
+	GList *windows;
+
 	if (NULL == application)
 		return (0);
 	pid = wnck_application_get_pid (application);
 	if (pid != 0)
 		return (pid);
-	return (wnck_window_get_pid (WNCK_WINDOW (wnck_application_get_windows (application)->data)));
+
+	windows = wnck_application_get_windows (application);
+
+	if (NULL == windows)
+		return (0);
+
+	return (wnck_window_get_pid (windows->data));
 }
 
 static gint