added toList() for Doc|Doc[]

1 files changed, 2 insertions, 2 deletions

diff --git a/src/client/views/LightboxView.tsx b/src/client/views/LightboxView.tsx
index 24433cd01..0dd836f70 100644
--- a/src/client/views/LightboxView.tsx
+++ b/src/client/views/LightboxView.tsx
@@ -12,7 +12,7 @@ import { emptyFunction } from '../../Utils';
 import { Doc, DocListCast, FieldResult, Opt } from '../../fields/Doc';
 import { Id } from '../../fields/FieldSymbols';
 import { InkTool } from '../../fields/InkField';
-import { Cast, NumCast } from '../../fields/Types';
+import { Cast, NumCast, toList } from '../../fields/Types';
 import { DocUtils } from '../documents/Documents';
 import { DocumentManager } from '../util/DocumentManager';
 import { LinkManager } from '../util/LinkManager';
@@ -119,7 +119,7 @@ export class LightboxView extends ObservableReactComponent<LightboxViewProps> {
     }
 
     public AddDocTab = (docs: Doc | Doc[], location: OpenWhere, layoutTemplate?: Doc | string) => {
-        const doc = (docs instanceof Doc ? [docs] : docs).lastElement();
+        const doc = toList(docs).lastElement();
         return this.SetLightboxDoc(
             doc,
             undefined,