diff --git a/packages/tools/src/tools/ScaleOverlayTool.ts b/packages/tools/src/tools/ScaleOverlayTool.ts
index ddc9ecb4d3..2ad7158fec 100644
--- a/packages/tools/src/tools/ScaleOverlayTool.ts
+++ b/packages/tools/src/tools/ScaleOverlayTool.ts
@@ -139,7 +139,7 @@ class ScaleOverlayTool extends AnnotationDisplayTool {
 
       addAnnotation(newAnnotation, viewport.element);
       annotation = newAnnotation;
-    } else if (this.editData.annotation.data.viewportId == viewport.id) {
+    } else if (this.editData.annotation && this.editData.annotation.data.viewportId == viewport.id) {
       this.editData.annotation.data.handles.points =
         viewportCanvasCornersInWorld;
       this.editData.annotation.data.viewportId = viewport.id;