fix(workspace): avoid data loss (hot-fix) (#6114)

packages/common/infra/src/blocksuite/migration/fixing.ts

@@ -13,6 +13,9 @@ export function fixWorkspaceVersion(rootDoc: YDoc) {
    * Blocksuite just set the value, do nothing else.
    */
   function doFix() {
+    if (meta.size === 0) {
+      return;
+    }
     const workspaceVersion = meta.get('workspaceVersion');
     if (typeof workspaceVersion !== 'number' || workspaceVersion < 2) {
       transact(

packages/frontend/workspace-impl/src/local/sync-sqlite.ts

@@ -19,6 +19,13 @@ export function createSQLiteStorage(workspaceId: string): SyncStorage {
       );
 
       if (update) {
+        if (
+          update.byteLength === 0 ||
+          (update.byteLength === 2 && update[0] === 0 && update[1] === 0)
+        ) {
+          return null;
+        }
+
         return {
           data: update,
           state: encodeStateVectorFromUpdate(update),