patch for occasional NPE when applet is quit

diff --git a/src/jalview/appletgui/AlignFrame.java b/src/jalview/appletgui/AlignFrame.java
index 842f82d..834b904 100644 (file)
--- a/src/jalview/appletgui/AlignFrame.java
+++ b/src/jalview/appletgui/AlignFrame.java
@@ -1286,8 +1286,13 @@ public class AlignFrame extends EmbmenuFrame implements ActionListener,  ItemLis
   public void closeMenuItem_actionPerformed()\r
   {\r
     PaintRefresher.RemoveComponent(alignPanel);\r
-    PaintRefresher.RemoveComponent(alignPanel.seqPanel.seqCanvas);\r
-    PaintRefresher.RemoveComponent(alignPanel.idPanel.idCanvas);\r
+    if (alignPanel.seqPanel!=null && alignPanel.seqPanel.seqCanvas!=null)\r
+    {\r
+      PaintRefresher.RemoveComponent(alignPanel.seqPanel.seqCanvas);\r
+    }\r
+    if (alignPanel.idPanel!=null && alignPanel.idPanel.idCanvas!=null) {\r
+      PaintRefresher.RemoveComponent(alignPanel.idPanel.idCanvas);\r
+    }\r
 \r
     if (PaintRefresher.components.size() == 0 && viewport.applet == null)\r
     {\r