From 3cb2b8c901713563ac7ff01ebec8cc7fcea2adfa Mon Sep 17 00:00:00 2001
From: Quincy Morgan <quincy.morgan@icloud.com>
Date: Tue, 4 Dec 2018 17:29:19 -0800
Subject: [PATCH] Fixes an issue where the walkthrough would not display and
 cause an error

---
 modules/ui/intro/intro.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/modules/ui/intro/intro.js b/modules/ui/intro/intro.js
index bdc85d23d..dbb737667 100644
--- a/modules/ui/intro/intro.js
+++ b/modules/ui/intro/intro.js
@@ -98,7 +98,10 @@ export function uiIntro(context) {
         // Setup data layers (only OSM)
         var layers = context.layers();
         layers.all().forEach(function(item) {
-            item.layer.enabled(item.id === 'osm');
+            // if the layer has the function `enabled`
+            if (typeof item.layer.enabled == 'function') {
+                item.layer.enabled(item.id === 'osm');
+            }
         });
 
         // Mock geocoder