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Uncaught TypeError: Cannot read properties of undefined (reading 'debounce')
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Description

Steps to replicate the issue (include links if applicable):
Go to https://en.wikipedia.org/wiki/Special:MassMessage (without sufficient userrights)

What happens?:

Uncaught TypeError: Cannot read properties of undefined (reading 'debounce')
    at badHtml (load.php?lang=en&modules=ext.MassMessage.special.js%7Cjquery%7Cjquery.ui&skin=vector&version=jbje7:3:788)
    at HTMLDocument.<anonymous> (load.php?lang=en&modules=ext.MassMessage.special.js%7Cjquery%7Cjquery.ui&skin=vector&version=jbje7:1:288)
    at mightThrow (load.php?lang=en&modules=ext.MassMessage.special.js%7Cjquery%7Cjquery.ui&skin=vector&version=jbje7:53:881)
    at process (load.php?lang=en&modules=ext.MassMessage.special.js%7Cjquery%7Cjquery.ui&skin=vector&version=jbje7:54:544)

What should have happened instead?:

No client error

Software version (skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):

Event Timeline

Change 935447 had a related patch set uploaded (by Ammarpad; author: Ammarpad):

[mediawiki/extensions/MassMessage@master] MassMessage.special.js: Guard against script errors for unprivileged view

https://gerrit.wikimedia.org/r/935447

Change 935447 merged by jenkins-bot:

[mediawiki/extensions/MassMessage@master] MassMessage.special.js: Guard against script errors for unprivileged view

https://gerrit.wikimedia.org/r/935447

Ammarpad claimed this task.