stack: Increase reference only if page is non-NULL

g_list_nth_data() may return NULL if position is off the end

diff --git a/gtk/gtkstack.c b/gtk/gtkstack.c
index 41aa4958b5ec1ad73e563366f28d4fe038c2d795..9b1488b3b20a261f275201bee5c1d4d05b2e2ced 100644 (file)
--- a/gtk/gtkstack.c
+++ b/gtk/gtkstack.c
@@ -538,6 +538,9 @@ gtk_stack_pages_get_item (GListModel *model,
 
   page = g_list_nth_data (priv->children, position);
 
+  if (!page)
+    return NULL;
+
   return g_object_ref (page);
 }