added toList() for Doc|Doc[]

1 files changed, 2 insertions, 2 deletions

diff --git a/src/client/views/nodes/PDFBox.tsx b/src/client/views/nodes/PDFBox.tsx
index fdba9ff49..780ac3acb 100644
--- a/src/client/views/nodes/PDFBox.tsx
+++ b/src/client/views/nodes/PDFBox.tsx
@@ -12,7 +12,7 @@ import { DocData } from '../../../fields/DocSymbols';
 import { Id } from '../../../fields/FieldSymbols';
 import { InkTool } from '../../../fields/InkField';
 import { ComputedField } from '../../../fields/ScriptField';
-import { Cast, FieldValue, ImageCast, NumCast, StrCast } from '../../../fields/Types';
+import { Cast, FieldValue, ImageCast, NumCast, StrCast, toList } from '../../../fields/Types';
 import { ImageField, PdfField } from '../../../fields/URLField';
 import { TraceMobx } from '../../../fields/util';
 import { emptyFunction } from '../../../Utils';
@@ -231,7 +231,7 @@ export class PDFBox extends ViewBoxAnnotatableComponent<FieldViewProps>() implem
     }
 
     sidebarAddDocTab = (docIn: Doc | Doc[], where: OpenWhere) => {
-        const docs = docIn instanceof Doc ? [docIn] : docIn;
+        const docs = toList(docIn);
         if (docs.some(doc => DocListCast(this.Document[this._props.fieldKey + '_sidebar']).includes(doc)) && !this.SidebarShown) {
             this.toggleSidebar(false);
             return true;