From b74ceb9c9259e5ab0f41922ce22fb5776152579d Mon Sep 17 00:00:00 2001
From: Bob Zeleznik <zzzman@gmail.com>
Date: Tue, 13 Aug 2019 21:57:25 -0400
Subject: fixed exception

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

(limited to 'src')

diff --git a/src/client/views/collections/CollectionStackingView.tsx b/src/client/views/collections/CollectionStackingView.tsx
index 4efd8e050..ce4c98671 100644
--- a/src/client/views/collections/CollectionStackingView.tsx
+++ b/src/client/views/collections/CollectionStackingView.tsx
@@ -293,7 +293,7 @@ export class CollectionStackingView extends CollectionSubView(doc => doc) {
             Math.floor((this.props.PanelWidth() - 2 * this.xMargin) / (this.columnWidth + this.gridGap))));
         let templatecols = "";
         for (let i = 0; i < cols; i++) templatecols += `${this.columnWidth}px `;
-        return <div key={heading.heading} className="collectionStackingView-masonrySection">
+        return <div key={heading ? heading.heading : "empty"} className="collectionStackingView-masonrySection">
             {!heading ? (null) :
                 <div key={`${heading.heading}`} className="collectionStackingView-sectionHeader" style={{ background: heading.color }}>
                     {heading.heading}
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