diff --git a/extensions/cornerstone/src/services/ViewportService/Viewport.ts b/extensions/cornerstone/src/services/ViewportService/Viewport.ts
index a99fa56af..e5b36342f 100644
--- a/extensions/cornerstone/src/services/ViewportService/Viewport.ts
+++ b/extensions/cornerstone/src/services/ViewportService/Viewport.ts
@@ -126,7 +126,7 @@ class ViewportInfo {
     if (!this.viewportData?.data) return false;
 
     if (this.viewportData.data.length) {
-      return !!this.viewportData.find(data =>
+      return !!this.viewportData.data.find(data =>
         dataContains(data, displaySetUID, imageId)
       );
     }