From a4833a9c3e15e416598b61e6887ee5743c3c2734 Mon Sep 17 00:00:00 2001
From: jprocter <Jim Procter>
Date: Wed, 31 Oct 2007 15:08:23 +0000
Subject: [PATCH] nullpointer bug fix on consensus thread

---
 src/jalview/gui/AlignViewport.java |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/jalview/gui/AlignViewport.java b/src/jalview/gui/AlignViewport.java
index afdfd69..a2d5ec2 100755
--- a/src/jalview/gui/AlignViewport.java
+++ b/src/jalview/gui/AlignViewport.java
@@ -513,7 +513,7 @@ public class AlignViewport
 
         try
         {
-          int aWidth = alignment.getWidth();
+          int aWidth = (alignment!=null) ? alignment.getWidth() : 0; // null pointer possibility here.
           if(aWidth<0)
         {
             return;
-- 
1.7.10.2