diff --git a/superset-frontend/src/features/alerts/AlertReportModal.tsx b/superset-frontend/src/features/alerts/AlertReportModal.tsx
index 1b56ed19d..e136675e3 100644
--- a/superset-frontend/src/features/alerts/AlertReportModal.tsx
+++ b/superset-frontend/src/features/alerts/AlertReportModal.tsx
@@ -683,7 +683,7 @@ const AlertReportModal: FunctionComponent<AlertReportModalProps> = ({
       ),
       recipients,
       report_format: reportFormat || DEFAULT_NOTIFICATION_FORMAT,
-      extra: contentType === ContentType.Dashboard ? currentAlert?.extra : null,
+      extra: contentType === ContentType.Dashboard ? currentAlert?.extra : {},
     };
 
     if (data.recipients && !data.recipients.length) {