diff --git a/app/src/frontend/building/header-buttons/copy-control.tsx b/app/src/frontend/building/header-buttons/copy-control.tsx
index e8f68f51..4d454e36 100644
--- a/app/src/frontend/building/header-buttons/copy-control.tsx
+++ b/app/src/frontend/building/header-buttons/copy-control.tsx
@@ -11,6 +11,7 @@ interface CopyControlProps {
 function initCopyControlProps(options?: Partial<CopyControlProps>): CopyControlProps {
     const defaults = {
         cat: '',
+        data_string: '',
         copying: true
     };