From cfbf1b2d6661bb62b2b8748b4c29c12690c7b0b4 Mon Sep 17 00:00:00 2001
From: jprocter <jprocter@compbio.dundee.ac.uk>
Date: Wed, 3 Aug 2011 14:00:12 +0100
Subject: [PATCH] fix NPE when applets stop. seems to make the simple applet
 alignment+structure example work again (JAL-592 ?)

---
 .../structure/StructureSelectionManager.java       |   23 +++++++++++++++-----
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/src/jalview/structure/StructureSelectionManager.java b/src/jalview/structure/StructureSelectionManager.java
index c4dda8b..e6634fc 100644
--- a/src/jalview/structure/StructureSelectionManager.java
+++ b/src/jalview/structure/StructureSelectionManager.java
@@ -789,13 +789,24 @@ public class StructureSelectionManager
    */
   public static void release(StructureSelectionManagerProvider jalviewLite)
   {
-    StructureSelectionManager mnger=(instances.get(jalviewLite));
-    if (mnger!=null)
+//    synchronized (instances)
     {
-      instances.remove(jalviewLite);
-      try {
-        mnger.finalize();
-      } catch (Throwable x){};
+      if (instances == null)
+      {
+        return;
+      }
+      StructureSelectionManager mnger = (instances.get(jalviewLite));
+      if (mnger != null)
+      {
+        instances.remove(jalviewLite);
+        try
+        {
+          mnger.finalize();
+        } catch (Throwable x)
+        {
+        }
+        ;
+      }
     }
   }
 
-- 
1.7.10.2