diff --git a/editor.planx.uk/src/pages/FlowEditor/lib/store/shared.ts b/editor.planx.uk/src/pages/FlowEditor/lib/store/shared.ts
index 2f31a63dd9..1b96cb8394 100644
--- a/editor.planx.uk/src/pages/FlowEditor/lib/store/shared.ts
+++ b/editor.planx.uk/src/pages/FlowEditor/lib/store/shared.ts
@@ -13,7 +13,7 @@ export interface SharedStore extends Store.Store {
   flow: Store.flow;
   flowSlug: string;
   flowName: string;
-  flowMetabaseLink: string;
+  flowMetabaseLink: string | null;
   id: string;
   getNode: (id: Store.nodeId) => Store.node | undefined;
   resetPreview: () => void;
@@ -52,7 +52,7 @@ export const sharedStore: StateCreator<
 
   flowName: "",
 
-  flowMetabaseLink: "",
+  flowMetabaseLink: null,
 
   id: "",
   previewEnvironment: "standalone",