From fc495cf49ef4515a5fcc9e9cd4c864bc79becc7e Mon Sep 17 00:00:00 2001
From: sjfink <sjfink@f5eafffb-2e1d-0410-98e4-8ec43c5233c4>
Date: Tue, 15 Apr 2008 12:03:50 +0000
Subject: [PATCH] bug fix for empty graphs

git-svn-id: https://wala.svn.sourceforge.net/svnroot/wala/trunk@2760 f5eafffb-2e1d-0410-98e4-8ec43c5233c4
---
 .../src/com/ibm/wala/util/graph/traverse/BFSIterator.java   | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/com.ibm.wala.core/src/com/ibm/wala/util/graph/traverse/BFSIterator.java b/com.ibm.wala.core/src/com/ibm/wala/util/graph/traverse/BFSIterator.java
index eede64600..48cce8fc5 100644
--- a/com.ibm.wala.core/src/com/ibm/wala/util/graph/traverse/BFSIterator.java
+++ b/com.ibm.wala.core/src/com/ibm/wala/util/graph/traverse/BFSIterator.java
@@ -100,8 +100,10 @@ public class BFSIterator<T> implements Iterator<T> {
       }
     }
     index = 0;
-    T current = Q.get(0);
-    visitChildren(current);
+    if (Q.size() > 0) {
+      T current = Q.get(0);
+      visitChildren(current);
+    }
   }
 
   private void visitChildren(T N) {