diff --git a/txfactory.go b/txfactory.go
index 1b2ca0328..4a6b84e6c 100644
--- a/txfactory.go
+++ b/txfactory.go
@@ -1322,7 +1322,9 @@ func (f *TxFactory) green2blue(holder *Holder) (err error) {
 	if err != nil {
 		return errors.Wrap(err, "TxFactory.green2blue f.greenHasData()")
 	}
+	vv("blueHasData = %v, greenHasData = %v", blueHasData, greenHasData)
 	if !greenHasData {
+		holder.Logger.Printf("error: cannot migrate from green '%v' because it has no data in it.", greenSrc)
 		return fmt.Errorf("error: cannot migrate from green '%v' because it has no data in it.", greenSrc)
 	}