From 651a9440a02b8237ad12387bb652711cc8ba34e3 Mon Sep 17 00:00:00 2001
From: jprocter <Jim Procter>
Date: Wed, 28 Apr 2010 10:18:56 +0000
Subject: [PATCH] null pointer when double click event occurs without an
 existing selection (happens when tooltip position has been
 locked using shift key, and then user double clicks).

---
 src/jalview/gui/SeqPanel.java |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/jalview/gui/SeqPanel.java b/src/jalview/gui/SeqPanel.java
index f260ec2..4036204 100755
--- a/src/jalview/gui/SeqPanel.java
+++ b/src/jalview/gui/SeqPanel.java
@@ -1425,12 +1425,14 @@ public class SeqPanel extends JPanel implements MouseListener,
 
   public void mouseClicked(MouseEvent evt)
   {
+    SequenceGroup sg=null;
     SequenceI sequence = av.alignment.getSequenceAt(findSeq(evt));
     if (evt.getClickCount() > 1)
     {
-      if (av.getSelectionGroup().getSize() == 1
-              && av.getSelectionGroup().getEndRes()
-                      - av.getSelectionGroup().getStartRes() < 2)
+      sg = av.getSelectionGroup();
+      if (sg!=null && sg.getSize() == 1
+              && sg.getEndRes()
+                      - sg.getStartRes() < 2)
       {
         av.setSelectionGroup(null);
       }
-- 
1.7.10.2