From 53ec6ec5b4b6288bd8f33162a9974cc3a0a16c91 Mon Sep 17 00:00:00 2001
From: jprocter <Jim Procter>
Date: Thu, 15 Apr 2010 09:20:28 +0000
Subject: [PATCH] nullpointer bugfix (another repaint racecondition)

---
 src/jalview/gui/SeqCanvas.java |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/jalview/gui/SeqCanvas.java b/src/jalview/gui/SeqCanvas.java
index 77b8938..ad5e052 100755
--- a/src/jalview/gui/SeqCanvas.java
+++ b/src/jalview/gui/SeqCanvas.java
@@ -695,7 +695,10 @@ public class SeqCanvas extends JComponent
     {
       nextSeq = av.alignment.getSequenceAt(i);
       if (nextSeq==null)
+      {
+        // occasionally, a race condition occurs such that the alignment row is empty
         continue;
+      }
       sr.drawSequence(nextSeq, av.alignment.findAllGroups(nextSeq),
               startRes, endRes, offset + ((i - startSeq) * av.charHeight));
 
-- 
1.7.10.2