1 files changed, 2 insertions, 2 deletions
diff --git a/src/client/views/nodes/DataVizBox/DataVizBox.tsx b/src/client/views/nodes/DataVizBox/DataVizBox.tsx
index 4c36d2fcb..12e8e1a69 100644
--- a/src/client/views/nodes/DataVizBox/DataVizBox.tsx
+++ b/src/client/views/nodes/DataVizBox/DataVizBox.tsx
@@ -44,8 +44,8 @@ export class DataVizBox extends ViewBoxAnnotatableComponent<FieldViewProps>() {
     private _annotationLayer: React.RefObject<HTMLDivElement> = React.createRef();
     anchorMenuClick?: () => undefined | ((anchor: Doc) => void);
     crop: ((region: Doc | undefined, addCrop?: boolean) => Doc | undefined) | undefined;
-    @observable schemaDataVizChildren: any;
-    @observable _marqueeing: number[] | undefined;
+    @observable schemaDataVizChildren: any = undefined;
+    @observable _marqueeing: number[] | undefined = undefined;
     @observable _savedAnnotations = new ObservableMap<number, HTMLDivElement[]>();
     @computed get annotationLayer() {
         TraceMobx();