diff --git a/lib/Instance.js b/lib/Instance.js
index b6d22d83..41970e42 100644
--- a/lib/Instance.js
+++ b/lib/Instance.js
@@ -236,6 +236,12 @@ function Instance(opts) {
 		addInstanceProperty(opts.id);
 	}
 
+	for (var k in opts.properties) {
+		if (opts.properties.hasOwnProperty(k) && !opts.data.hasOwnProperty(k) && k != opts.id) {
+			opts.data[k] = null;
+		}
+	}
+
 	for (var k in opts.data) {
 		if (!opts.data.hasOwnProperty(k)) continue;
 		if (!opts.properties.hasOwnProperty(k) && k != opts.id && opts.association_properties.indexOf(k) == -1) {