X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fdatamodel%2FAlignment.java;fp=src%2Fjalview%2Fdatamodel%2FAlignment.java;h=2dafc0c96ec121c9ac7521ef6160aa5084ce0c4d;hb=f5c4a8a268a77ac474addbc778e85b75ffa05da3;hp=41488ea9001f6df106e9f9771b9c8a71c1203dad;hpb=c17287513835107ee932196055aef39364b02e92;p=jalview.git

diff --git a/src/jalview/datamodel/Alignment.java b/src/jalview/datamodel/Alignment.java
index 41488ea..2dafc0c 100755
--- a/src/jalview/datamodel/Alignment.java
+++ b/src/jalview/datamodel/Alignment.java
@@ -1011,6 +1011,10 @@ public class Alignment implements AlignmentI
     }
     else if (dataset == null && data != null)
     {
+      if (data == this)
+      {
+        throw new IllegalArgumentException("Circular dataset reference");
+      }
       if (!(data instanceof Alignment))
       {
         throw new Error(