diff --git a/deno.json b/deno.json
index 10d8157..c8b100d 100644
--- a/deno.json
+++ b/deno.json
@@ -1,6 +1,6 @@
 {
   "name": "@izure/serializable-bptree",
-  "version": "5.0.1",
+  "version": "5.0.2",
   "description": "Store the B+tree flexibly, not only in-memory.",
   "author": "izure1 <admin@izure.org>",
   "license": "MIT",
diff --git a/package.json b/package.json
index e8a6288..1466729 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "serializable-bptree",
-  "version": "5.0.1",
+  "version": "5.0.2",
   "description": "Store the B+tree flexibly, not only in-memory.",
   "types": "./dist/types/index.d.ts",
   "main": "./dist/cjs/index.cjs",
diff --git a/src/BPTreeAsync.ts b/src/BPTreeAsync.ts
index 92cb1ee..cf5a247 100644
--- a/src/BPTreeAsync.ts
+++ b/src/BPTreeAsync.ts
@@ -427,8 +427,8 @@ export class BPTreeAsync<K, V> extends BPTree<K, V> {
       this.root = await this._createNode(true, [], [], true)
       this.strategy.head.root = this.root.id
       this.bufferForNodeCreate(this.root)
-      this.commitHeadBuffer()
-      this.commitNodeCreateBuffer()
+      await this.commitHeadBuffer()
+      await this.commitNodeCreateBuffer()
     }
     // loaded
     else {