diff --git a/docx-wasm/js/numbering.ts b/docx-wasm/js/numbering.ts
index a97078d..3c8f5b5 100644
--- a/docx-wasm/js/numbering.ts
+++ b/docx-wasm/js/numbering.ts
@@ -3,7 +3,7 @@ import { LevelOverride } from "./level";
 export class Numbering {
   id: number;
   abstractNumId: number;
-  overrides: LevelOverride[];
+  overrides: LevelOverride[] = [];
 
   constructor(id: number, abstractNumId: number) {
     this.id = id;
diff --git a/docx-wasm/package.json b/docx-wasm/package.json
index 19a97d5..4b1e3b2 100644
--- a/docx-wasm/package.json
+++ b/docx-wasm/package.json
@@ -1,6 +1,6 @@
 {
   "name": "docx-wasm",
-  "version": "0.0.76",
+  "version": "0.0.77",
   "main": "dist/node/index.js",
   "browser": "dist/web/index.js",
   "author": "bokuweb <bokuweb12@gmail.com>",