Test fix for crash

source/ubl-settings-datetime.c

@@ -266,6 +266,7 @@ void yon_interface_update(main_window *widgets){
     }
 
     GTimeZone *tz = g_time_zone_new_identifier(config(ZONE_parameter));
+    if (tz){
         GDateTime *datetime = g_date_time_new_now(tz);
         char *time = g_date_time_format(datetime,"%H %M");
         char *format = yon_settings_configuration_get(date_format_parameter);
@@ -273,7 +274,6 @@ void yon_interface_update(main_window *widgets){
         gtk_calendar_select_month(GTK_CALENDAR(widgets->DateCalendar),g_date_time_get_month(datetime)-1,g_date_time_get_year(datetime));
         gtk_calendar_select_day(GTK_CALENDAR(widgets->DateCalendar),g_date_time_get_day_of_month(datetime));
         g_date_time_unref(datetime);
-    g_time_zone_unref(tz);
 
         if (!yon_char_is_empty(time)){
             char *hour = yon_char_divide_search(time," ",-1);
@@ -299,6 +299,8 @@ void yon_interface_update(main_window *widgets){
         g_signal_handlers_unblock_by_func(G_OBJECT(widgets->TimeSyncTypeCombo),G_CALLBACK(yon_save_parameters),widgets);
         g_signal_handlers_unblock_by_func(G_OBJECT(widgets->RegionCombo),G_CALLBACK(yon_save_parameters),widgets);
         g_signal_handlers_unblock_by_func(G_OBJECT(widgets->ZoneCombo),G_CALLBACK(yon_save_parameters),widgets);
+        g_time_zone_unref(tz);
+    }
 }
 
 void on_date_clicked(GtkWidget *,main_window *widgets){