From 059fba719c6d07859521ef8effdf275ed18ea9fb Mon Sep 17 00:00:00 2001
From: amwaterhouse <Andrew Waterhouse>
Date: Thu, 30 Nov 2006 14:42:19 +0000
Subject: [PATCH] sg might be null if mouse released after coloumns removed

---
 src/jalview/gui/ScalePanel.java |   13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/src/jalview/gui/ScalePanel.java b/src/jalview/gui/ScalePanel.java
index 7ed0146..99b8620 100755
--- a/src/jalview/gui/ScalePanel.java
+++ b/src/jalview/gui/ScalePanel.java
@@ -196,15 +196,16 @@ public class ScalePanel extends JPanel implements MouseMotionListener, MouseList
 
         SequenceGroup sg = av.getSelectionGroup();
 
-        if (res > sg.getStartRes())
-        {
+        if(sg!=null){
+          if (res > sg.getStartRes())
+          {
             sg.setEndRes(res);
-        }
-        else if (res < sg.getStartRes())
-        {
+          }
+          else if (res < sg.getStartRes())
+          {
             sg.setStartRes(res);
+          }
         }
-
         stretchingGroup = false;
         ap.repaint();
     }
-- 
1.7.10.2