From a97bfc58e5b17a265492371f0daade71b5a6d570 Mon Sep 17 00:00:00 2001
From: Brandon Parsons <parsons.brandon@gmail.com>
Date: Wed, 22 Jul 2015 06:45:43 -0600
Subject: [PATCH] Observer was causing timing issues - check for presence of
 element before using it.

---
 addon/components/md-select.js | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/addon/components/md-select.js b/addon/components/md-select.js
index 6894c06c..d86555ca 100644
--- a/addon/components/md-select.js
+++ b/addon/components/md-select.js
@@ -27,15 +27,17 @@ export default MaterializeInputField.extend({
   errorsDidChange: Ember.observer('errors', function() {
     var inputSelector = this.$('input');
     // monitor the select's validity and copy the appropriate validation class to the materialize input element.
-    Ember.run.later(this, function() {
-      var isValid = this.$('select').hasClass('valid');
-      if (isValid) {
-        inputSelector.removeClass('invalid');
-        inputSelector.addClass('valid');
-      } else {
-        inputSelector.removeClass('valid');
-        inputSelector.addClass('invalid');
-      }
-    }, 150);
+    if (!Ember.isNone(inputSelector)) {
+      Ember.run.later(this, function() {
+        var isValid = this.$('select').hasClass('valid');
+        if (isValid) {
+          inputSelector.removeClass('invalid');
+          inputSelector.addClass('valid');
+        } else {
+          inputSelector.removeClass('valid');
+          inputSelector.addClass('invalid');
+        }
+      }, 150);
+    }
   })
 });