Cannot read properties of undefined (reading 'childNamed')

Describe the bug Simply running the script doesn't work. When the target file does not already exists, it creates it fine with no error. When it already exists, it throws this error.

Setup/Configuration Provide relevant (parts) of files like angular.json, package.json, messages.xlf etc.

Angular.json

 "extract-i18n": {
          "builder": "ng-extract-i18n-merge:ng-extract-i18n-merge",
          "options": {
            "browserTarget": "home:build",
            "format": "xlf2",
            "outputPath": "projects/home/src/i18n",
            "targetFiles": ["messages.ja.xlf"]
          }
        },

samples japanese messages.js.xlf

<?xml version="1.0" encoding="UTF-8"?>
<xliff version="1.2" xmlns="urn:oasis:names:tc:xliff:document:1.2">
  <file source-language="en-US" datatype="plaintext" original="ng2.template">
    <body>
      <trans-unit id="cfba7b438a8d15f97984d3fd83c4a9d4516bb52c" datatype="html">
        <source> Super Simple Scheduling </source>
        <target> 簡単な予約！ </target>
        <context-group purpose="location">
          <context context-type="sourcefile">
            projects/home/src/app/landing-page/home-page/home-page.component.html</context>
          <context context-type="linenumber">24,26</context>
        </context-group>
      </trans-unit>
    </body>
  </file>
</xliff>

Expected behavior No error, merge correctly.

Screenshots If applicable, add screenshots to help explain your problem.

Version (please complete the following information):

Angular: 17
OS:Win 11
nodejs: 20
ng-extract-i18n-merge version: 2.9.1

daniel-sc / ng-extract-i18n-merge

Cannot read properties of undefined (reading 'childNamed') #90