diff --git a/ui/ui.go b/ui/ui.go
index d1a3007..340888d 100644
--- a/ui/ui.go
+++ b/ui/ui.go
@@ -2290,7 +2290,7 @@ func makePacketListModel(psml psmlInfo, app gowid.IApp) *psmlmodel.Model {
 
 	if len(expandingModel.Comparators) > 0 {
 		for i, _ := range expandingModel.Comparators {
-			if i < len(widths) {
+			if i < len(widths) && i < len(cols) {
 				if field, ok := shark.AllowedColumnFormats[cols[i].Field.Token]; ok {
 					if field.Comparator != nil {
 						expandingModel.Comparators[i] = field.Comparator