From 6c1024e9cbf1960307ac9b4bda19a7480b5d51bc Mon Sep 17 00:00:00 2001
From: Otto Winter <otto@otto-winter.com>
Date: Sun, 2 Jun 2019 13:49:11 +0200
Subject: [PATCH] Fix validation infinite loop with empty platform block

---
 esphome/util.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/esphome/util.py b/esphome/util.py
index bad660cd5a..5622cfdca2 100644
--- a/esphome/util.py
+++ b/esphome/util.py
@@ -187,7 +187,9 @@ class OrderedDict(collections.OrderedDict):
 
     def move_to_end(self, key, last=True):
         if IS_PY2:
-            if last:
+            if len(self) == 1:
+                return
+            elif last:
                 # When moving to end, just pop and re-add
                 val = self.pop(key)
                 self[key] = val