1 files changed, 2 insertions, 0 deletions
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index af3d17a0d5..f6516e5130 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -9872,6 +9872,8 @@ gdk_window_set_geometry_hints (GdkWindow         *window,
 			       const GdkGeometry *geometry,
 			       GdkWindowHints     geom_mask)
 {
+  g_return_if_fail (geometry != NULL || geom_mask == 0);
+
   GDK_WINDOW_IMPL_GET_CLASS (window->impl)->set_geometry_hints (window, geometry, geom_mask);
 }