X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fgui%2FAlignFrame.java;h=9818e6b08c500b2dd9601ddea816fdd354e7fe89;hb=48b925b3dd950c86b1add0f2a90a2d0f8b6e316e;hp=a50e724ec08a957a914b423929c59b37e3c0dbad;hpb=f186f2abe25325f1cb9da40d1e8623d6bfa781a8;p=jalview.git

diff --git a/src/jalview/gui/AlignFrame.java b/src/jalview/gui/AlignFrame.java
index a50e724..9818e6b 100755
--- a/src/jalview/gui/AlignFrame.java
+++ b/src/jalview/gui/AlignFrame.java
@@ -880,7 +880,7 @@ public class AlignFrame extends GAlignFrame implements DropTargetListener,
         for (int i = 0; i < frames.length; i++)
         {
           if (frames[i] instanceof AlignFrame && frames[i] != this
-                  && ((AlignFrame) frames[i]).fileName.equals(fileName))
+                  && ((AlignFrame) frames[i]).fileName!=null && ((AlignFrame) frames[i]).fileName.equals(fileName))
           {
             try
             {