--- a/util/dataforms.lua	Sun Jul 15 22:35:42 2018 +0200
+++ b/util/dataforms.lua	Sun Jul 15 22:50:05 2018 +0200
@@ -155,7 +155,7 @@
 			if field.required then
 				errors[field.name] = "Required value missing";
 			end
-		else
+		elseif field.name then
 			present[field.name] = true;
 			local reader = field_readers[field.type];
 			if reader then