設定ファイルを複数回変更するとエラー

[re3turn]

設定ファイルを複数回変更すると以下のようなエラーが出るのですかこれは問題ないエラーなのでしょうか？

You have triggered an unhandledRejection, you may have forgotten to catch a Promise rejection:
TypeError: Cannot read property 'reserves' of undefined
     at FSWatcher.<anonymous> (/service/src/services/config.ts:34:44)
     at FSWatcher.emit (events.js:203:13)
     at FSWatcher.EventEmitter.emit (domain.js:471:20)
     at FSWatcher.emitWithAll (/service/node_modules/chokidar/index.js:521:8)
     at FSWatcher._emit (/service/node_modules/chokidar/index.js:613:10)
     at /service/node_modules/chokidar/lib/nodefs-handler.js:370:20
 (node:51) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

動作環境

• Alpine Linux 3.9(on Docker)
• node v12.6.0