diff --git a/src/toolbar.c b/src/toolbar.c
index 379e6a2..b75a5c4 100644
--- a/src/toolbar.c
+++ b/src/toolbar.c
@@ -51,8 +51,11 @@ GtkWidget * desktop_toolbar_create(DesktopToolbar * toolbar, gpointer data,
 		}
 		else
 			p->widget = gtk_tool_button_new(NULL, _(p->name));
-		g_signal_connect_swapped(G_OBJECT(p->widget), "clicked",
-				G_CALLBACK(p->callback), data);
+		if(p->callback != NULL)
+			g_signal_connect_swapped(G_OBJECT(p->widget), "clicked",
+					G_CALLBACK(p->callback), data);
+		else
+			gtk_widget_set_sensitive(p->widget, FALSE);
 		if(accel != NULL && p->accel != 0)
 			gtk_widget_add_accelerator(GTK_WIDGET(p->widget),
 					"clicked", accel, p->accel, p->modifier,