X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fdatamodel%2FContactListImpl.java;h=7058ac7f4ed1d00bfd67977fed5efa34c4aa0acb;hb=562e94c776a874b2cb8e29e76d24c1478f0a69c8;hp=bb31c5d6ca76f497e0d94c00702ed9edb0810d04;hpb=6d3348aa17d3bd5c9b3f028d97b9dde965e4a78c;p=jalview.git

diff --git a/src/jalview/datamodel/ContactListImpl.java b/src/jalview/datamodel/ContactListImpl.java
index bb31c5d..7058ac7 100644
--- a/src/jalview/datamodel/ContactListImpl.java
+++ b/src/jalview/datamodel/ContactListImpl.java
@@ -88,7 +88,7 @@ public class ContactListImpl implements ContactListI
         }
       }
     }
-    if (tot > 0)
+    if (tot > 0 && to_column>from_column)
     {
       cr.setMean(tot / (1 + to_column - from_column));
     }