diff --git a/gtk/gtkrange.c b/gtk/gtkrange.c
index 774174df52..f53e08434d 100644
--- a/gtk/gtkrange.c
+++ b/gtk/gtkrange.c
@@ -2711,6 +2711,9 @@ gtk_range_multipress_gesture_pressed (GtkGestureMultiPress *gesture,
   priv->mouse_y = y;
 
   gtk_range_update_mouse_location (range);
+  if (!priv->mouse_location)
+    return;
+
   gtk_css_gadget_get_margin_box (priv->slider_gadget, &slider_alloc);
 
   g_object_get (gtk_widget_get_settings (widget),