diff --git a/‎src/lib/base.html‎
Lines changed: 3 additions & 1 deletion b/‎src/lib/base.html‎
Lines changed: 3 additions & 1 deletion
@@ -40,7 +40,9 @@
     },
 
     createdCallback: function() {
-      this._ensureRegisterFinished(this.__proto__);
+      if (!this.__hasRegisterFinished) {
+        this._ensureRegisterFinished(this.__proto__);
+      }
       Polymer.telemetry.instanceCount++;
       this.root = this;
       this._doBehavior('created'); // abstract