From ba7df6c1d7dd2913d6d9a79618c043538de74d5a Mon Sep 17 00:00:00 2001
From: hneemann <helmut.neemann@arcor.de>
Date: Sat, 21 Nov 2020 19:49:01 +0100
Subject: [PATCH] fixes a null pointer exception

---
 src/main/java/de/neemann/digital/hdl/model2/HDLNet.java | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/main/java/de/neemann/digital/hdl/model2/HDLNet.java b/src/main/java/de/neemann/digital/hdl/model2/HDLNet.java
index 0290aa473..698664ac9 100644
--- a/src/main/java/de/neemann/digital/hdl/model2/HDLNet.java
+++ b/src/main/java/de/neemann/digital/hdl/model2/HDLNet.java
@@ -203,6 +203,8 @@ public class HDLNet implements Printable, HasName {
      * @return true if this is a clock net
      */
     public boolean isClock() {
+        if (output == null)
+            return false;
         return output.isClock();
     }