Compound components are throwing Error: Element type is invalid in next 15.5.5

[IshfaqAhmedProg]

Link to the code that reproduces this issue

https://codesandbox.io/p/devbox/zpk3k2

To Reproduce

1. Start the application in development mode

Current vs. Expected behavior

Current Behaviour

Next js throws this error

Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.

Expected Behaviour

Next js should render the compound component

Provide environment information

Operating System:
  Platform: win32
  Arch: x64
  Version: Windows 10 Home
  Available memory (MB): 12157
  Available CPU cores: 4
Binaries:
  Node: 20.18.0
  npm: 10.9.1
  Yarn: N/A
  pnpm: 9.15.4
Relevant Packages:
  next: 15.5.5 // Latest available version is detected (15.5.5).
  eslint-config-next: 15.5.4
  react: 19.1.0
  react-dom: 19.1.0
  typescript: 5.9.2
Next.js Config:
  output: N/A

Which area(s) are affected? (Select all that apply)

Not sure

Which stage(s) are affected? (Select all that apply)

next dev (local)

Additional context

I reproduced this issue in codesandbox and local setup, console logging results in this

page.tsx (Home)

console.log("Tab:", Tabs.Tab);  // undefined

Tabs.tsx

console.log("Tab:", Tabs.Tab);  // Tab: [Function: Tab]

[likhith5697]

Hi, I can reproduce this issue and would like to work on a fix. Please let me know if no one is already handling it

[icyJoseph]

Hi, explanation here: #75192 (comment)

So, if your page (Home) component had use client it'd work.

As that comment says, React has an error message for this, but over at Next.js is not showing up for some reason.

[github-actions]

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