diff --git a/frontend/sync-client/src/services/types/DocumentWithCursors.ts b/frontend/sync-client/src/services/types/DocumentWithCursors.ts
index cbe56399..dae654c7 100644
--- a/frontend/sync-client/src/services/types/DocumentWithCursors.ts
+++ b/frontend/sync-client/src/services/types/DocumentWithCursors.ts
@@ -2,7 +2,7 @@
 import type { CursorSpan } from "./CursorSpan";
 
 export interface DocumentWithCursors {
-	vault_update_id: number;
+	vault_update_id: number | null;
 	document_id: string;
 	relative_path: string;
 	cursors: CursorSpan[];
diff --git a/sync-server/src/app_state/websocket/models.rs b/sync-server/src/app_state/websocket/models.rs
index ed61177c..7f1a3073 100644
--- a/sync-server/src/app_state/websocket/models.rs
+++ b/sync-server/src/app_state/websocket/models.rs
@@ -23,8 +23,9 @@ pub struct CursorPositionFromClient {
 
 #[derive(TS, Serialize, Deserialize, Clone, Debug)]
 pub struct DocumentWithCursors {
-    #[ts(as = "u32")]
-    pub vault_update_id: VaultUpdateId,
+    // It's None in case the document is dirty
+    #[ts(as = "Option<u32>")]
+    pub vault_update_id: Option<VaultUpdateId>,
 
     pub document_id: DocumentId,
     pub relative_path: String,