From 700dfc5add1ecd9c2b1ecafcdc593ff821b7a6a6 Mon Sep 17 00:00:00 2001
From: bob <bcz@cs.brown.edu>
Date: Tue, 20 Aug 2019 17:20:27 -0400
Subject: UI enhancements and other backend fixes for templates.

---
 src/client/views/collections/CollectionStackingView.tsx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src/client/views/collections/CollectionStackingView.tsx')

diff --git a/src/client/views/collections/CollectionStackingView.tsx b/src/client/views/collections/CollectionStackingView.tsx
index 1f7ef0689..c74c60d8f 100644
--- a/src/client/views/collections/CollectionStackingView.tsx
+++ b/src/client/views/collections/CollectionStackingView.tsx
@@ -160,7 +160,8 @@ export class CollectionStackingView extends CollectionSubView(doc => doc) {
             previewScript={undefined}>
         </CollectionSchemaPreview>;
     }
-    getDocHeight(d: Doc) {
+    getDocHeight(d?: Doc) {
+        if (!d) return 0;
         let nw = NumCast(d.nativeWidth);
         let nh = NumCast(d.nativeHeight);
         if (!d.ignoreAspect && nw && nh) {
-- 
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