Index: openacs-4/packages/dotlrn-ecommerce/www/admin/ecommerce/invoice-payment.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/dotlrn-ecommerce/www/admin/ecommerce/invoice-payment.tcl,v
diff -u -r1.9 -r1.10
--- openacs-4/packages/dotlrn-ecommerce/www/admin/ecommerce/invoice-payment.tcl	20 Nov 2019 14:06:41 -0000	1.9
+++ openacs-4/packages/dotlrn-ecommerce/www/admin/ecommerce/invoice-payment.tcl	29 Nov 2019 14:28:48 -0000	1.10
@@ -216,8 +216,8 @@
     } else {
 	set billing_address_id 0 
 	# no previous billing address, set defaults
-	set bill_to_first_names [value_if_exists first_names]
-	set bill_to_last_name [value_if_exists last_name]
+	set bill_to_first_names [expr {[info exists first_names] ? $first_names : ""}]
+	set bill_to_last_name [expr {[info exists last_name] ? $last_name : ""}]
 
 	set bill_to_line1 ""
 	set bill_to_line2 ""