From 53e173cca675e35beda54a96641441b33c8cd0b9 Mon Sep 17 00:00:00 2001
From: Jim Meyering <jim@meyering.net>
Date: Sun, 22 Aug 1999 16:10:24 +0000
Subject: (detect_loop): There's no loop if k->top is NULL.

---
 src/tsort.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/tsort.c')

diff --git a/src/tsort.c b/src/tsort.c
index 0b36a3368..f26cfa395 100644
--- a/src/tsort.c
+++ b/src/tsort.c
@@ -315,7 +315,7 @@ scan_zeros (struct item *k)
 static void
 detect_loop (struct item *k)
 {
-  if (k->count > 0)
+  if (k->count > 0 && k->top)
     {
       while (k && k->count > 0)
 	{
-- 
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