From cccea3ec3ea799d3df51a2eb2dcd945a149e4508 Mon Sep 17 00:00:00 2001
From: EYHN <cneyhn@gmail.com>
Date: Thu, 14 Mar 2024 13:14:03 +0800
Subject: [PATCH] fix(workspace): avoid data loss (hot-fix) (#6114)

---
 packages/common/infra/src/blocksuite/migration/fixing.ts  | 3 +++
 packages/frontend/workspace-impl/src/local/sync-sqlite.ts | 7 +++++++
 2 files changed, 10 insertions(+)

diff --git a/packages/common/infra/src/blocksuite/migration/fixing.ts b/packages/common/infra/src/blocksuite/migration/fixing.ts
index 5813da65da..840cb5a623 100644
--- a/packages/common/infra/src/blocksuite/migration/fixing.ts
+++ b/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(
diff --git a/packages/frontend/workspace-impl/src/local/sync-sqlite.ts b/packages/frontend/workspace-impl/src/local/sync-sqlite.ts
index a0f3b99c93..c2ea474482 100644
--- a/packages/frontend/workspace-impl/src/local/sync-sqlite.ts
+++ b/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),