1 files changed, 1 insertions, 1 deletions
diff --git a/src/client/views/collections/CollectionStackingView.tsx b/src/client/views/collections/CollectionStackingView.tsx
index 288c38730..2e4f6aff5 100644
--- a/src/client/views/collections/CollectionStackingView.tsx
+++ b/src/client/views/collections/CollectionStackingView.tsx
@@ -63,7 +63,7 @@ export class CollectionStackingView extends CollectionSubView(doc => doc) {
             setTimeout(() => this.props.Document.sectionHeaders = new List<SchemaHeaderField>(), 0);
             return new Map<SchemaHeaderField, Doc[]>();
         }
-        const sectionHeaders = this.sectionHeaders!;
+        const sectionHeaders = this.sectionHeaders;
         let fields = new Map<SchemaHeaderField, Doc[]>(sectionHeaders.map(sh => [sh, []] as [SchemaHeaderField, []]));
         this.filteredChildren.map(d => {
             let sectionValue = (d[this.sectionFilter] ? d[this.sectionFilter] : `NO ${this.sectionFilter.toUpperCase()} VALUE`) as object;