The most frustrating bug I hit this week (React Native + Expo)

Published: 4 days ago (May 6, 2026 at 12:22 PM EDT)

1 min read

Source: Dev.to

Source: Dev.to

Situation

My app won’t render at all on my phone—just a blank screen and multiple errors.

App screenshot showing blank screen

Main error

“Incompatible React versions”

react: 19.2.5
react-native-renderer: 19.1.0

Error message about incompatible React versions

What I’m seeing

Invalid hook call
“Cannot read property of undefined.”
Components failing before rendering

Console output showing errors

Additional details

It looks like a small version mismatch, but it completely breaks everything.

Further screenshot of the issue

I’m still digging into it. If anyone has encountered this in an Expo + monorepo setup, I’d really appreciate any pointers.

Will update once I figure it out 🙌

Tags: reactnative expo debugging buildinpublic

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