From 41f0cff35451eb7ef81f1e5f955f63f0aa49b29f Mon Sep 17 00:00:00 2001
From: Cliff Click <cliffc@acm.org>
Date: Sat, 9 Aug 2025 08:23:14 -0700
Subject: Missing null check

---
 chapter23/src/main/java/com/seaofnodes/simple/node/RegionNode.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'chapter23/src/main')

diff --git a/chapter23/src/main/java/com/seaofnodes/simple/node/RegionNode.java b/chapter23/src/main/java/com/seaofnodes/simple/node/RegionNode.java
index 6f740a47..e25c2380 100644
--- a/chapter23/src/main/java/com/seaofnodes/simple/node/RegionNode.java
+++ b/chapter23/src/main/java/com/seaofnodes/simple/node/RegionNode.java
@@ -130,7 +130,7 @@ public class RegionNode extends CFGNode {
             if( use instanceof PhiNode ) {
                 for( Node data : use._outputs ) {
                     if( !(data instanceof PhiNode phi2) || phi2.region()!=this )
-                        { addDep(use); addDep(data); return true; }
+                        { addDep(use); if( data!=null ) addDep(data); return true; }
                 }
             } else
                 { addDep(use);  return true; } // Control user
-- 
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