From dbc5042263d1c35e8ab1624e36882b53f3f83170 Mon Sep 17 00:00:00 2001
From: Holger Vogt <holger.vogt@uni-due.de>
Date: Fri, 15 Sep 2023 23:42:08 +0200
Subject: [PATCH] Prevent a crash if port cntrl is set to NULL

---
 src/xspice/icm/analog/delay/cfunc.mod | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/src/xspice/icm/analog/delay/cfunc.mod b/src/xspice/icm/analog/delay/cfunc.mod
index a1bd95d83..0830bcc12 100644
--- a/src/xspice/icm/analog/delay/cfunc.mod
+++ b/src/xspice/icm/analog/delay/cfunc.mod
@@ -298,13 +298,17 @@ void cm_delay(ARGS)
         delmin = loc->tdelmin;
         delmax = loc->tdelmax;
 
-        lcntrl =  INPUT(cntrl);
-        if (lcntrl < 0)
-            lcntrl = 0.;
-        else if (lcntrl > 1.)
-            lcntrl = 1.;
-
         if (PARAM(has_delay_cnt) == MIF_TRUE) {
+            if (!PORT_NULL(cntrl)) {
+                lcntrl =  INPUT(cntrl);
+                if (lcntrl < 0)
+                    lcntrl = 0.;
+                else if (lcntrl > 1.)
+                    lcntrl = 1.;
+            }
+            else {
+                lcntrl = 0;
+            }
             delay = (delmax - delmin) * lcntrl + delmin;
         }