diff --git a/packages/core/api/index.js b/packages/core/api/index.js
index 4ad5789be..3ea17d844 100644
--- a/packages/core/api/index.js
+++ b/packages/core/api/index.js
@@ -137,7 +137,7 @@ class Database {
     }, 15 * 1000);
   }
 
-  sync(full) {
+  sync(full = true) {
     return this.syncer.start(full);
   }
 
diff --git a/packages/core/migrations.js b/packages/core/migrations.js
index 7af10584a..3a7b6585c 100644
--- a/packages/core/migrations.js
+++ b/packages/core/migrations.js
@@ -35,7 +35,7 @@ export const migrations = {
       const notebook = item.notebook;
       delete item.notebook;
       if (notebook && notebook.id && notebook.topic) {
-        notebook.topics = [notebook.topics];
+        notebook.topics = [notebook.topic];
         delete notebook.topic;
         item.notebooks = [notebook];
       }