diff --git a/src/renderer/loaders/groundnet_writer.js b/src/renderer/loaders/groundnet_writer.js
index 3d5e686..a908f8e 100644
--- a/src/renderer/loaders/groundnet_writer.js
+++ b/src/renderer/loaders/groundnet_writer.js
@@ -206,7 +206,7 @@ var mapParkings = function (o) {
             console.debug(o.options.attributes.airlineCodes);
             parking['@airlineCodes'] = o.options.attributes.airlineCodes;
         }
-        if(o.options.attributes.number) {
+        if(o.options.attributes.number && o.options.attributes.number.trim() !== '') {
             console.debug(o.options.attributes.number);
             parking['@number'] = o.options.attributes.number;
         }