diff --git a/lib/core/Manager.js b/lib/core/Manager.js
index c3a73ec8..9036cc7a 100644
--- a/lib/core/Manager.js
+++ b/lib/core/Manager.js
@@ -191,13 +191,18 @@ Manager.prototype.areCompatible = function (candidate, resolved) {
 
 Manager.prototype.toData = function (decEndpoint, extraKeys) {
     var names;
+    var extra;
 
     var data = {};
     data.endpoint = mout.object.pick(decEndpoint, ['name', 'source', 'target']);
     mout.object.mixIn(data, mout.object.pick(decEndpoint, ['canonicalDir', 'pkgMeta']));
 
     if (extraKeys) {
-        mout.object.mixIn(data, mout.object.pick(decEndpoint, extraKeys));
+        extra = mout.object.pick(decEndpoint, extraKeys);
+        extra = mout.object.filter(extra, function (value) {
+            return !!value;
+        });
+        mout.object.mixIn(data, extra);
     }
 
     if (decEndpoint.dependencies) {