---
title: "Discussion on \"Readable Hermes stack traces for Expo/EAS: one release per JS bundle\" | Hashnode"
description: "Discussion on \"Readable Hermes stack traces for Expo/EAS: one release per JS bundle\". Your Expo app crashes in production and the error tracker shows this:\nTypeError: undefined is not an object (evaluating 'e.items.length')\n    at anonymous (index.android.bundle:1:284133)\n    at map (n"
url: "https://hashnode.com/posts/readable-hermes-stack-traces-for-expo-eas-one-release-per-js-bundle/6ace207368b2cfb54352ef01"
---

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Discussion

# [Readable Hermes stack traces for Expo/EAS: one release per JS bundle](https://telemetry-tracker.hashnode.dev/readable-hermes-stack-traces-for-expo-eas-one-release-per-js-bundle?utm_source=hashnode&utm_medium=feed)

Your Expo app crashes in production and the error tracker shows this: TypeError: undefined is not an object (evaluating 'e.items.length') at anonymous (index.android.bundle:1:284133) at map (n

Oct 13 · 6 min read · telemetry-tracker.hashnode.dev  
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-   [#react-native](https://hashnode.com/tag/react-native)
-   [#expo](https://hashnode.com/tag/expo)
-   [#hermes](https://hashnode.com/tag/hermes)
-   [#sourcemaps](https://hashnode.com/tag/sourcemaps)
-   [#debugging](https://hashnode.com/tag/debugging)

## Written by

[Sanja Malovic](https://hashnode.com/@unjica)

@unjica

  
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