Group menu button not working in IE11

Summary

When logged into GitLab Community Edition 11.4.3 with IE11 the group menu button doesn't work, the drop down arrow on the button isn't present and the error console reports:

SCRIPT1003: Expected ':'
main.7cc878a3.chunk.js (114,58671)

Steps to reproduce

To reproduce simply log into a GitLab Community Edition instance with IE11.

Output of checks

Results of GitLab environment info

Expand for output related to GitLab environment info

System information
System: 
Current User:   git
Using RVM:      no
Ruby Version:   2.4.5p335
Gem Version:    2.7.6
Bundler Version:1.16.2
Rake Version:   12.3.1
Redis Version:  3.2.12
Git Version:    2.18.1
Sidekiq Version:5.2.1
Go Version:     unknown
GitLab information
Version:        11.4.3
Revision:       adea99b
Directory:      /opt/gitlab/embedded/service/gitlab-rails
DB Adapter:     postgresql
URL:            https://.....
HTTP Clone URL: https://...../some-group/some-project.git
SSH Clone URL:  git@.....:some-group/some-project.git
Using LDAP:     yes
Using Omniauth: yes
Omniauth Providers: saml
GitLab Shell
Version:        8.3.3
Repository storage paths:

• default: /var/opt/gitlab/git-data/repositories Hooks: /opt/gitlab/embedded/service/gitlab-shell/hooks Git: /opt/gitlab/embedded/bin/git

Results of GitLab application Check

Expand for output related to the GitLab application check

Checking GitLab Shell ...
GitLab Shell version >= 8.3.3 ? ... OK (8.3.3)
Repo base directory exists?
default... yes
Repo storage directories are symlinks?
default... no
Repo paths owned by git:root, or git:git?
default... yes
Repo paths access is drwxrws---?
default... yes
hooks directories in repos are links: ...
11/4 ... repository is empty
14/5 ... repository is empty
15/6 ... repository is empty
14/7 ... repository is empty
2/8 ... ok
19/9 ... ok
21/10 ... ok
21/11 ... ok
24/14 ... repository is empty
12/15 ... ok
14/16 ... ok
27/17 ... ok
21/18 ... ok
21/19 ... ok
21/20 ... ok
21/21 ... repository is empty
21/22 ... ok
21/23 ... repository is empty
21/24 ... ok
21/25 ... ok
21/26 ... ok
21/27 ... ok
21/28 ... ok
21/29 ... ok
21/30 ... ok
21/31 ... ok
21/32 ... ok
21/33 ... ok
21/34 ... ok
21/35 ... ok
21/36 ... ok
21/37 ... repository is empty
21/38 ... ok
21/39 ... ok
21/40 ... ok
21/41 ... ok
37/42 ... ok
36/43 ... repository is empty
36/44 ... repository is empty
Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Check GitLab API access: OK
Redis available via internal API: OK
Access to /var/opt/gitlab/.ssh/authorized_keys: OK
gitlab-shell self-check successful
Checking GitLab Shell ... Finished
Checking Sidekiq ...
Running? ... yes
Number of Sidekiq processes ... 1
Checking Sidekiq ... Finished
Reply by email is disabled in config/gitlab.yml
Checking LDAP ...
Server: ldapmain
LDAP authentication... Success
LDAP users with access to your GitLab server (only showing the first 100 results)
.
.
.
Checking LDAP ... Finished
Checking GitLab ...
Git configured correctly? ... yes
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
Init script exists? ... skipped (omnibus-gitlab has no init script)
Init script up-to-date? ... skipped (omnibus-gitlab has no init script)
Projects have namespace: ...
11/4 ... yes
14/5 ... yes
15/6 ... yes
14/7 ... yes
2/8 ... yes
19/9 ... yes
21/10 ... yes
21/11 ... yes
24/14 ... yes
12/15 ... yes
14/16 ... yes
27/17 ... yes
21/18 ... yes
21/19 ... yes
21/20 ... yes
21/21 ... yes
21/22 ... yes
21/23 ... yes
21/24 ... yes
21/25 ... yes
21/26 ... yes
21/27 ... yes
21/28 ... yes
21/29 ... yes
21/30 ... yes
21/31 ... yes
21/32 ... yes
21/33 ... yes
21/34 ... yes
21/35 ... yes
21/36 ... yes
21/37 ... yes
21/38 ... yes
21/39 ... yes
21/40 ... yes
21/41 ... yes
37/42 ... yes
36/43 ... yes
36/44 ... yes
Redis version >= 2.8.0? ... yes
Ruby version >= 2.3.5 ? ... yes (2.4.5)
Git version >= 2.9.5 ? ... yes (2.18.1)
Git user has default SSH configuration? ... yes
Active users: ... 18
Checking GitLab ... Finished