From 86658c0236d5c129d54fa478d2af4660bfc47824 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20Lov=C3=A9n?= <thomasloven@gmail.com>
Date: Mon, 11 Mar 2019 19:47:47 +0100
Subject: [PATCH] Fix thomasloven/lovelace-card-tools#16

---
 card-tools.js | 39 ++++++++++++++++++++++-----------------
 1 file changed, 22 insertions(+), 17 deletions(-)

diff --git a/card-tools.js b/card-tools.js
index 61479d0..5ae38d6 100644
--- a/card-tools.js
+++ b/card-tools.js
@@ -46,27 +46,32 @@ class {
     if(entity) {
       entity.dispatchEvent(ev);
     } else {
-      var root = document
-        .querySelector("home-assistant")
-        .shadowRoot.querySelector("home-assistant-main")
-        .shadowRoot.querySelector("app-drawer-layout partial-panel-resolver")
-        .shadowRoot.querySelector("ha-panel-lovelace")
-        .shadowRoot.querySelector("hui-root")
-      if (root)
-        root
-          .shadowRoot.querySelector("ha-app-layout #view")
-          .firstElementChild
-          .dispatchEvent(ev);
+      var root = document.querySelector("home-assistant");
+      root = root && root.shadowRoot;
+      root = root && root.querySelector("home-assistant-main");
+      root = root && root.shadowRoot;
+      root = root && root.querySelector("app-drawer-layout partial-panel-resolver");
+      root = root && root.shadowRoot;
+      root = root && root.querySelector("ha-panel-lovelace");
+      root = root && root.shadowRoot;
+      root = root && root.querySelector("hui-root");
+      root = root && root.shadowRoot;
+      root = root && root.querySelector("ha-app-layout #view");
+      root = root && root.firstElementChild;
+      if (root) root.dispatchEvent(ev);
     }
   }
 
   static get lovelace() {
-    var root = document
-      .querySelector("home-assistant")
-      .shadowRoot.querySelector("home-assistant-main")
-      .shadowRoot.querySelector("app-drawer-layout partial-panel-resolver")
-      .shadowRoot.querySelector("ha-panel-lovelace")
-      .shadowRoot.querySelector("hui-root")
+    var root = document.querySelector("home-assistant");
+    root = root && root.shadowRoot;
+    root = root && root.querySelector("home-assistant-main");
+    root = root && root.shadowRoot;
+    root = root && root.querySelector("app-drawer-layout partial-panel-resolver");
+    root = root && root.shadowRoot;
+    root = root && root.querySelector("ha-panel-lovelace")
+    root = root && root.shadowRoot;
+    root = root && root.querySelector("hui-root")
     if (root) {
       var ll =  root.lovelace
       ll.current_view = root.___curView;