From 2641476245d6cb1e9e85d37c6c539741aff2800d Mon Sep 17 00:00:00 2001
From: Simon Tatham <anakin@pobox.com>
Date: Thu, 11 Jan 2007 09:39:35 +0000
Subject: Duplicate fix of Kevin Lyles's bug from r7092.

[originally from svn r7093]
[r7092 == c06e371f55b97576421588d21d809c02c637584b in puzzles repository]
---
 tree234.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/tree234.c b/tree234.c
index 06738cb..26d188e 100644
--- a/tree234.c
+++ b/tree234.c
@@ -1440,8 +1440,11 @@ tree234 *copytree234(tree234 *t, copyfn234 copyfn, void *copyfnstate) {
     tree234 *t2;
 
     t2 = newtree234(t->cmp);
-    t2->root = copynode234(t->root, copyfn, copyfnstate);
-    t2->root->parent = NULL;
+    if (t->root) {
+	t2->root = copynode234(t->root, copyfn, copyfnstate);
+	t2->root->parent = NULL;
+    } else
+	t2->root = NULL;
 
     return t2;
 }
@@ -2122,11 +2125,12 @@ int main(void) {
     tree = newtree234(mycmp);
     cmp = mycmp;
     arraylen = 0;
-    for (i = 0; i < 16; i++) {
-	addtest(strings[i]);
+    for (i = 0; i < 17; i++) {
 	tree2 = copytree234(tree, NULL, NULL);
 	splittest(tree2, array, arraylen);
 	freetree234(tree2);
+	if (i < 16)
+	    addtest(strings[i]);
     }
     freetree234(tree);
 
-- 
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