X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fviewmodel%2FOverviewDimensionsShowHidden.java;h=5bd4bbaba11b53e9391b9595593514ecd87490cf;hb=4a9a2fc8a1b1a66b21e66429083f27a6fc8541b9;hp=c4b69a86e37d1fc124b7fcc79163e59eea2cafa6;hpb=30f552046feaba47955d5ffdcec6d0fc67a7e13b;p=jalview.git

diff --git a/src/jalview/viewmodel/OverviewDimensionsShowHidden.java b/src/jalview/viewmodel/OverviewDimensionsShowHidden.java
index c4b69a8..5bd4bba 100644
--- a/src/jalview/viewmodel/OverviewDimensionsShowHidden.java
+++ b/src/jalview/viewmodel/OverviewDimensionsShowHidden.java
@@ -81,7 +81,9 @@ public class OverviewDimensionsShowHidden extends OverviewDimensions
     int visXAsRes = hiddenCols.findColumnPosition(xAsRes);
     yAsSeq = hiddenSeqs.adjustForHiddenSeqs(
             hiddenSeqs.findIndexWithoutHiddenSeqs(yAsSeq));
+    yAsSeq = Math.max(yAsSeq, 0); // -1 if before first visible sequence
     int visYAsSeq = hiddenSeqs.findIndexWithoutHiddenSeqs(yAsSeq);
+    visYAsSeq = Math.max(visYAsSeq, 0); // -1 if before first visible sequence
 
     // update viewport accordingly
     updateViewportFromTopLeft(visXAsRes, visYAsSeq, hiddenSeqs, hiddenCols);