diff --git a/packages/common/nbstore/src/utils/__tests__/id-converter.spec.ts b/packages/common/nbstore/src/utils/__tests__/id-converter.spec.ts
new file mode 100644
index 0000000000..9abc07ac4f
--- /dev/null
+++ b/packages/common/nbstore/src/utils/__tests__/id-converter.spec.ts
@@ -0,0 +1,51 @@
+import { beforeAll, describe, expect, it } from 'vitest';
+
+import { getIdConverter, type IdConverter } from '../id-converter';
+
+const workspaceId = 'aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa';
+const userId = 'bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb';
+
+const oldIds = [
+  workspaceId,
+  'abcdefg',
+  `db$${workspaceId}$folder`,
+  `db$${workspaceId}$docProperties`,
+  `userdata$${userId}$${workspaceId}$favorite`,
+];
+
+const newIds = [`db$folder`, `db$docProperties`, `userdata$${userId}$favorite`];
+
+let converter: IdConverter;
+
+beforeAll(async () => {
+  converter = await getIdConverter(
+    {
+      getDocBuffer: async () => null,
+    },
+    workspaceId
+  );
+});
+
+describe('idConverter', async () => {
+  it('should convert old id to new id', () => {
+    expect(oldIds.map(id => converter.oldIdToNewId(id))).toMatchInlineSnapshot(`
+      [
+        "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa",
+        "abcdefg",
+        "db$folder",
+        "db$docProperties",
+        "userdata$bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb$favorite",
+      ]
+    `);
+  });
+
+  it('should convert new id to old id', () => {
+    expect(newIds.map(id => converter.newIdToOldId(id))).toMatchInlineSnapshot(`
+      [
+        "db$aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa$folder",
+        "db$aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa$docProperties",
+        "userdata$bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb$aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa$favorite",
+      ]
+    `);
+  });
+});
diff --git a/packages/common/nbstore/src/utils/id-converter.ts b/packages/common/nbstore/src/utils/id-converter.ts
index a2d96b41b4..14f57699f3 100644
--- a/packages/common/nbstore/src/utils/id-converter.ts
+++ b/packages/common/nbstore/src/utils/id-converter.ts
@@ -64,7 +64,7 @@ export async function getIdConverter(
         return oldId.replace(`db$${spaceId}$`, `db$`);
       }
       // userdata$userId$spaceId$docId -> userdata$userId$docId
-      if (oldId.match(new RegExp(`^userdata\\$[\\w-]+\\$${spaceId}$`))) {
+      if (oldId.match(new RegExp(`^userdata\\$[\\w-]+\\$${spaceId}\\$`))) {
         return oldId.replace(`$${spaceId}$`, '$');
       }
       return oldIdToNewId[oldId] ?? oldId;