Index: gtk/gtkscalebutton.c
===================================================================
--- gtk/gtkscalebutton.c	(revision 18880)
+++ gtk/gtkscalebutton.c	(revision 18881)
@@ -877,6 +877,9 @@
 
   priv = button->priv;
 
+  if (!GTK_WIDGET_HAS_GRAB (priv->dock))
+    return;
+
   if (gtk_widget_is_ancestor (gtk_grab_get_current (), priv->dock))
     return;
 
Index: tests/testvolumebutton.c
===================================================================
--- tests/testvolumebutton.c	(revision 18880)
+++ tests/testvolumebutton.c	(revision 18881)
@@ -60,15 +60,22 @@
 {
 	GtkWidget *window;
 	GtkWidget *button;
+	GtkWidget *button2;
+	GtkWidget *box;
 
 	gtk_init (&argc, &argv);
 
 	window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
 	button = gtk_volume_button_new ();
+	button2 = gtk_volume_button_new ();
+ 	box = gtk_hbox_new (FALSE, 0);      
+  
 	g_signal_connect (G_OBJECT (button),
 			  "value-changed",
 			  G_CALLBACK (value_changed), NULL);
-	gtk_container_add (GTK_CONTAINER (window), button);
+	gtk_container_add (GTK_CONTAINER (window), box);
+	gtk_container_add (GTK_CONTAINER (box), button);
+	gtk_container_add (GTK_CONTAINER (box), button2);
 
 	gtk_widget_show_all (window);
 	gtk_button_clicked (GTK_BUTTON (button));