diff --git a/gnucash/gnome-utils/dialog-options.c b/gnucash/gnome-utils/dialog-options.c
index c6f48c1a7e2..50a654ee051 100644
--- a/gnucash/gnome-utils/dialog-options.c
+++ b/gnucash/gnome-utils/dialog-options.c
@@ -2273,7 +2273,8 @@ gnc_options_dialog_new_modal(gboolean modal, gchar *title,
 
     gtk_builder_connect_signals_full (builder, gnc_builder_connect_full_func, retval);
 
-    gnc_restore_window_size (GNC_PREFS_GROUP, GTK_WINDOW(retval->window), parent);
+    if (parent) // when added to a page of the hierarchy assistant there will be no parent
+        gnc_restore_window_size (GNC_PREFS_GROUP, GTK_WINDOW(retval->window), parent);
 
     if (title)
         gtk_window_set_title(GTK_WINDOW(retval->window), title);