diff --git a/paper-input-decorator.html b/paper-input-decorator.html
index 94fe910..b95c2c0 100644
--- a/paper-input-decorator.html
+++ b/paper-input-decorator.html
@@ -401,6 +401,9 @@
        * @return {boolean} True if the input is valid.
        */
       validate: function() {
+        if (!this.input) {
+          return true;
+        }
         this.isInvalid = !this.input.validity.valid;
         return this.input.validity.valid;
       },