From d2177bbd69a620286b2b8ecb88fc19ea67ea5035 Mon Sep 17 00:00:00 2001
From: Holger Vogt <holger.vogt@uni-due.de>
Date: Mon, 17 Apr 2023 11:54:25 +0200
Subject: [PATCH] Prevent reading from NULL

---
 src/spicelib/analysis/optran.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/spicelib/analysis/optran.c b/src/spicelib/analysis/optran.c
index 175d96146..3f32263d2 100644
--- a/src/spicelib/analysis/optran.c
+++ b/src/spicelib/analysis/optran.c
@@ -100,6 +100,11 @@ void com_optran(wordlist* wl) {
         getdata = TRUE;
     }
 
+    if (!getdata && !ft_curckt) {
+        /* no circuit, but optran already set */
+        return;
+    }
+
     int saved = errno;
     errno = 0;
     nooptran = FALSE;