X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fdatamodel%2FDBRefSource.java;fp=src%2Fjalview%2Fdatamodel%2FDBRefSource.java;h=3b1757bf18ad52cfe2269c0e6413f16f1e1d7a32;hb=a350dc895531b6249b12267525f99be74448378e;hp=f384b1e1109498b3d4678f560b86a50be6c84d0a;hpb=cd886ae669962ea7fff5fb46627b3f84e77d295d;p=jalview.git

diff --git a/src/jalview/datamodel/DBRefSource.java b/src/jalview/datamodel/DBRefSource.java
index f384b1e..3b1757b 100755
--- a/src/jalview/datamodel/DBRefSource.java
+++ b/src/jalview/datamodel/DBRefSource.java
@@ -154,6 +154,11 @@ public class DBRefSource
 
   public static boolean isPrimaryCandidate(String ucversion)
   {
+    if (ucversion==null)
+    {
+      // Null/empty version is not a real reference ?
+      return false;
+    }
     // tricky - this test really needs to search the sequence's set of dbrefs to
     // see if there is a primary reference that derived this reference.
     for (int i = allSources.length; --i >= 0;)