don’t > on undefined

emberjs · Jul 30, 2014 · 77adcc5 · 77adcc5
1 parent 20d7491
commit 77adcc5
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/packages/ember-metal/lib/properties.js b/packages/ember-metal/lib/properties.js
@@ -97,7 +97,9 @@ export function defineProperty(obj, keyName, desc, data, meta) {
   if (!meta) meta = metaFor(obj);
   descs = meta.descs;
   existingDesc = meta.descs[keyName];
-  watching = meta.watching[keyName] > 0;
+  var watchEntry = meta.watching[keyName];
+
+  watching = watchEntry !== undefined && watchEntry > 0;
 
   if (existingDesc instanceof Descriptor) {
     existingDesc.teardown(obj, keyName);