From 920c6e69283f9bef5d3aa67776b868696e438c2d Mon Sep 17 00:00:00 2001
From: Tim Edwards <tim@opencircuitdesign.com>
Date: Sun, 20 Dec 2020 11:55:20 -0500
Subject: [PATCH] Corrected a problem causing a segfault during a property
 record copy if the property record does not have a model.class record (should
 it always?).

---
 VERSION       | 2 +-
 base/netgen.c | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/VERSION b/VERSION
index 8740e51..5409a56 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.5.160
+1.5.161
diff --git a/base/netgen.c b/base/netgen.c
index 2c9fc88..f2e3830 100644
--- a/base/netgen.c
+++ b/base/netgen.c
@@ -2470,7 +2470,8 @@ void CopyProperties(struct objlist *obj_to, struct objlist *obj_from)
       kvcur->value.ival = 0;
 
       obj_to->instance.props = kvcopy;
-      obj_to->model.class = strsave(obj_from->model.class);
+      if (obj_from->model.class)
+         obj_to->model.class = strsave(obj_from->model.class);
    }
 }