bug: classList of undefined, navigating between tabs and no tabs

[jake-newsom]

Prerequisites

• I have read the Contributing Guidelines.
• I agree to follow the Code of Conduct.
• I have searched for existing issues that already report this problem, without success.

Ionic Framework Version

• v4.x
• v5.x
• v6.x

Current Behavior

After navigating between multiple pages within a tabbed view, then navigating to a non-tabbed view, and then navigating back into the tabbed view, the app throws a javascript error "Cannot read property 'classList' of undefined" (which breaks further page processing in our main app)

Expected Behavior

There should be no javascript error when navigating from the non-tabbed view back to the tabbed view

Steps to Reproduce

• Start the app from scratch
• Click "View Blog"
• Go back
• Click "View Script"
• Click "Open New Feature"
• Go back (should result in error)

Code Reproduction URL

https://github.com/jake-newsom/ionic-tab-example

Ionic Info

[WARN] Error loading @capacitor/ios package.json: Error: Cannot find module '@capacitor/ios/package'

   Require stack:
   - C:\Users\Jake\AppData\Roaming\npm\node_modules\@ionic\cli\lib\project\index.js
   - C:\Users\Jake\AppData\Roaming\npm\node_modules\@ionic\cli\lib\index.js
   - C:\Users\Jake\AppData\Roaming\npm\node_modules\@ionic\cli\index.js
   - C:\Users\Jake\AppData\Roaming\npm\node_modules\@ionic\cli\bin\ionic

[WARN] Error loading @capacitor/android package.json: Error: Cannot find module '@capacitor/android/package'

   Require stack:
   - C:\Users\Jake\AppData\Roaming\npm\node_modules\@ionic\cli\lib\project\index.js
   - C:\Users\Jake\AppData\Roaming\npm\node_modules\@ionic\cli\lib\index.js
   - C:\Users\Jake\AppData\Roaming\npm\node_modules\@ionic\cli\index.js
   - C:\Users\Jake\AppData\Roaming\npm\node_modules\@ionic\cli\bin\ionic

Ionic:

Ionic CLI : 6.17.0 (C:\Users\Jake\AppData\Roaming\npm\node_modules@ionic\cli)
Ionic Framework : @ionic/vue 5.9.3

Capacitor:

Capacitor CLI : 3.4.0
@capacitor/android : not installed
@capacitor/core : 3.4.0
@capacitor/ios : not installed

Utility:

cordova-res : 0.15.3
native-run : 1.5.0

System:

NodeJS : v14.17.3 (C:\Program Files\nodejs\node.exe)
npm : 6.14.13
OS : Windows 10

Additional Information

Steps that weirdly don't result in the error:

• Start the app from scratch
• Click "View Script"
• Click "Open New Feature"
• Go back

It only triggers if I view a sibling page within the tabbed view first

[liamdebeasi]

Thanks for the issue. Does this issue reproduce in Ionic 6? There was a very similar issue fixed in 6.0.1: bf8e436

[jake-newsom]

@liamdebeasi Yes it appears so, I ran
npm install @ionic/[email protected] @ionic/[email protected]

Reloaded my VSCode window and restarted ionic serve and can still reproduce the issue.

[liamdebeasi]

Thanks for the issue. Can you try the following dev build and let me know if it resolves the issue?

npm install @ionic/[email protected] @ionic/[email protected]

[jake-newsom]

Tried it out on the sample project and it resolves the issue!

[liamdebeasi]

Thanks for the issue. This has been resolved via #24665, and a fix will be available in an upcoming release of Ionic Framework.

[ionitron-bot]

Thanks for the issue! This issue is being locked to prevent comments that are not relevant to the original issue. If this is still an issue with the latest version of Ionic, please create a new issue and ensure the template is fully filled out.