diff --git a/src/views/trials/trials-panel/reading/dicoms3D/components/tools/ScaleOverlayTool.js b/src/views/trials/trials-panel/reading/dicoms3D/components/tools/ScaleOverlayTool.js
index 5c1611d9..d4b86797 100644
--- a/src/views/trials/trials-panel/reading/dicoms3D/components/tools/ScaleOverlayTool.js
+++ b/src/views/trials/trials-panel/reading/dicoms3D/components/tools/ScaleOverlayTool.js
@@ -58,7 +58,7 @@ class ScaleOverlayTool extends AnnotationDisplayTool {
             }
             enabledElements.forEach((element) => {
                 const { viewport } = element;
-                if (!viewportsWithAnnotations.includes(viewport.id) || annotations.length === 0) {
+                if (!viewportsWithAnnotations.includes(viewport.id) || annotations.length === 0 || !annotation) {
                     const newAnnotation = {
                         metadata: {
                             toolName: this.getToolName(),