From e7402803dfa7a41c8f9f8a21c138e83861ffa4d6 Mon Sep 17 00:00:00 2001
From: Liang Chang <l-chang@users.sourceforge.net>
Date: Fri, 12 Feb 2021 18:25:25 +0800
Subject: [PATCH] dtcm: fix a segfault that occurred when opening the
 "Appointment List..." in the "View" menu.

---
 cde/programs/dtcm/dtcm/editor.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/cde/programs/dtcm/dtcm/editor.c b/cde/programs/dtcm/dtcm/editor.c
index 0a9d7e624..193c99782 100644
--- a/cde/programs/dtcm/dtcm/editor.c
+++ b/cde/programs/dtcm/dtcm/editor.c
@@ -1922,6 +1922,12 @@ show_editor_view(Calendar *c, Glance glance) {
 	Editor		*e = (Editor *)c->editor;
 	Props_pu	*p = (Props_pu *)c->properties_pu;
 
+	if (get_data_version(c->cal_handle) <= CMS_VERS_2) {
+		backend_err_msg(c->frame, c->view->current_calendar,
+			CSA_E_NOT_SUPPORTED, p->xm_error_pixmap);
+		return;
+	}
+
 	if (!e->view_frame) {
 		e->cal = c;
 		e_build_view_popup(e);