--- a/examples/xep0004.lua	Sat Mar 14 16:51:11 2009 +0200
+++ b/examples/xep0004.lua	Sun Mar 15 02:33:57 2009 +0200
@@ -50,7 +50,7 @@
 			else
 				if field:child ( 'value' ) then
 					field_value = field:child( 'value' ):value ()
-					form.exp = form.exp .. '   Default value: ' .. field_value .. '\n'
+					form.exp = form.exp .. '   Default value: ' .. (field_value or '') .. '\n'
 				end
 			end