[gtk/gtk-3-24: 1/2] Check for NULL priv->popup_window in gtk_combo_box_popdown()

[Matthias Clasen <matthiasc src gnome org>]

commit aa5d926c843aca2af576c38cf25ebdb4d3da2c26
Author: Luca Bacci <luca bacci982 gmail com>
Date:   Tue Aug 28 18:39:05 2018 +0200

    Check for NULL priv->popup_window in gtk_combo_box_popdown()
    
    Fixes issue #125

 gtk/gtkcombobox.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/gtk/gtkcombobox.c b/gtk/gtkcombobox.c
index cf01278db5..e6589b4c90 100644
--- a/gtk/gtkcombobox.c
+++ b/gtk/gtkcombobox.c
@@ -2429,6 +2429,9 @@ gtk_combo_box_popdown (GtkComboBox *combo_box)
   if (!gtk_widget_get_realized (GTK_WIDGET (combo_box)))
     return;
 
+  if (!priv->popup_window)
+    return;
+
   if (!gtk_widget_is_drawable (priv->popup_window))
     return;