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-rw-r--r--src/client/views/nodes/ComparisonBox.tsx2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/client/views/nodes/ComparisonBox.tsx b/src/client/views/nodes/ComparisonBox.tsx
index b1aada158..0f962f95c 100644
--- a/src/client/views/nodes/ComparisonBox.tsx
+++ b/src/client/views/nodes/ComparisonBox.tsx
@@ -90,7 +90,7 @@ export class ComparisonBox extends ViewBoxAnnotatableComponent<ViewBoxAnnotatabl
const displayDoc = (which: string) => {
var whichDoc = Cast(this.dataDoc[which], Doc, null);
//if (whichDoc?.type === DocumentType.MARKER)
- const targetDoc = Cast(whichDoc.annotationOn, Doc, null) ?? whichDoc;
+ const targetDoc = Cast(whichDoc?.annotationOn, Doc, null) ?? whichDoc;
return whichDoc ? <>
<DocumentView
ref={(r) => {