White screen of death on creating new project

Summary

After upgrading our omnibus install from 15.03-EE to 15.1-EE the create project button action results in a white screen of death. Checked the browser console for errors and consistently got this error on pressing the button.

legacy_container.vue:279 
        
       Uncaught TypeError: Cannot read properties of null (reading 'addEventListener')
    at Object.bindEvents (legacy_container.vue:279:21)
    at Module.MXJS (form_text.js:10:16)
    at r (bootstrap:84:22)
    at 203 (pages.projects.new.d6165b50.chunk.js:1:3451)
    at r (bootstrap:84:22)
    at l (bootstrap:45:15)
    at Array.a [as push] (bootstrap:32:11)
    at pages.projects.new.d6165b50.chunk.js:1:43

Steps to reproduce

Upgraded omnibus installation
Pushed create new project button

Example Project

not applicable

What is the current bug behavior?

See summary, that is all the details I can produce on this issue.

What is the expected correct behavior?

The new project select screen.

Relevant logs and/or screenshots

legacy_container.vue:279 
        
       Uncaught TypeError: Cannot read properties of null (reading 'addEventListener')
    at Object.bindEvents (legacy_container.vue:279:21)
    at Module.MXJS (form_text.js:10:16)
    at r (bootstrap:84:22)
    at 203 (pages.projects.new.d6165b50.chunk.js:1:3451)
    at r (bootstrap:84:22)
    at l (bootstrap:45:15)
    at Array.a [as push] (bootstrap:32:11)
    at pages.projects.new.d6165b50.chunk.js:1:43

Output of checks

What checks am I supposed to run?

Results of GitLab environment info

root@gitlab:~# sudo gitlab-rake gitlab:check SANITIZE=true
Checking GitLab subtasks ...

Checking GitLab Shell ...

GitLab Shell: ... GitLab Shell version >= 14.7.4 ? ... OK (14.7.4)
Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Internal API available: OK
Redis available via internal API: OK
gitlab-shell self-check successful

Checking GitLab Shell ... Finished

Checking Gitaly ...

Gitaly: ... default ... OK

Checking Gitaly ... Finished

Checking Sidekiq ...

Sidekiq: ... Running? ... yes
Number of Sidekiq processes (cluster/worker) ... 1/1

Checking Sidekiq ... Finished

Checking Incoming Email ...

Incoming Email: ... Reply by email is disabled in config/gitlab.yml

Checking Incoming Email ... Finished

Checking LDAP ...

LDAP: ... LDAP is disabled in config/gitlab.yml

Checking LDAP ... Finished

Checking GitLab App ...

Database config exists? ... yes
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... yes
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory exists? ... yes
Uploads directory has correct permissions? ... yes
Uploads directory tmp has correct permissions? ... yes
Systemd unit files or init script exist? ... skipped (omnibus-gitlab has neither init script nor systemd units)
Systemd unit files or init script up-to-date? ... skipped (omnibus-gitlab has neither init script nor systemd units)
Projects have namespace: ...
2/1 ... yes
2/2 ... yes
2/6 ... yes
2/8 ... yes
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55/12 ... yes
2/15 ... yes
2/20 ... yes
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447/461 ... yes
42/462 ... yes
42/463 ... yes
Redis version >= 5.0.0? ... yes
Ruby version >= 2.7.2 ? ... yes (2.7.5)
Git user has default SSH configuration? ... yes
Active users: ... 23
Is authorized keys file accessible? ... yes
GitLab configured to store new projects in hashed storage? ... yes
All projects are in hashed storage? ... yes

Checking GitLab App ... Finished


Checking GitLab subtasks ... Finished