[gtk/ebassi/for-master: 1/2] a11y: Check before disconnecting selection signals

[Emmanuele Bassi <ebassi src gnome org>]

commit fdf2e046c3e83faf9d3b0f347b32e9dcc0415995
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed Nov 25 18:13:54 2020 +0000

    a11y: Check before disconnecting selection signals
    
    If the selection data has already been cleared we should just bail out.
    
    Fixes: #3404

 gtk/a11y/gtkatspiselection.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/gtk/a11y/gtkatspiselection.c b/gtk/a11y/gtkatspiselection.c
index 6bc501e57a..adfdbf021a 100644
--- a/gtk/a11y/gtkatspiselection.c
+++ b/gtk/a11y/gtkatspiselection.c
@@ -1132,6 +1132,8 @@ gtk_atspi_disconnect_selection_signals (GtkAccessible *accessible)
       SelectionChanged *changed;
 
       changed = g_object_get_data (G_OBJECT (accessible), "accessible-selection-data");
+      if (changed == NULL)
+        return;
 
       g_signal_handlers_disconnect_by_func (accessible, changed->changed, changed->data);
 
@@ -1143,6 +1145,8 @@ gtk_atspi_disconnect_selection_signals (GtkAccessible *accessible)
       SelectionChanged *changed;
 
       changed = g_object_get_data (G_OBJECT (accessible), "accessible-selection-data");
+      if (changed == NULL)
+        return;
 
       g_signal_handlers_disconnect_by_func (notebook, changed->changed, changed->data);