Changes are not loading in merge request

Summary

Getting an 500 error on the following request diffs.json?w=0

Steps to reproduce

Going to a merge request and clicking on changes. This only happens on a particular merge request with 25 commits and 19 changes. Other merge requests are fine.

Example Project

Don't really have one. This is happening on a self-hosted environment.

What is the current bug behavior?

It doesn't load the changes. There is an error in the console. Shown in the uploaded image

What is the expected correct behavior?

You should see the list of files that were modified along with their changes.

Relevant logs and/or screenshots

image

image

Output of checks

(If you are reporting a bug on GitLab.com, write: This bug happens on GitLab.com)

Results of GitLab environment info

Expand for output related to GitLab environment info 
System information
System:         Ubuntu 18.04
Proxy:          no
Current User:   git
Using RVM:      no
Ruby Version:   2.6.3p62
Gem Version:    2.7.9
Bundler Version:1.17.3
Rake Version:   12.3.2
Redis Version:  3.2.12
Git Version:    2.21.0
Sidekiq Version:5.2.7
Go Version:     unknown


GitLab information
Version:        12.1.2-ee
Revision:       d7aa668babd
Directory:      /opt/gitlab/embedded/service/gitlab-rails
DB Adapter:     PostgreSQL
DB Version:     10.7
URL:            https://git.inteloom.com
HTTP Clone URL: https://git.inteloom.com/some-group/some-project.git
SSH Clone URL:  git@git.inteloom.com:some-group/some-project.git
Elasticsearch:  no
Geo:            no
Using LDAP:     no
Using Omniauth: yes
Omniauth Providers:


GitLab Shell
Version:        9.3.0
Repository storage paths:
  • default: /var/opt/gitlab/git-data/repositories GitLab Shell path: /opt/gitlab/embedded/service/gitlab-shell Git: /opt/gitlab/embedded/bin/git

Results of GitLab application Check

Expand for output related to the GitLab application check 
Checking GitLab subtasks ...


Checking GitLab Shell ...


GitLab Shell: ... GitLab Shell version >= 9.3.0 ? ... OK (9.3.0)
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 Gitaly ...


Gitaly: ... default ... OK


Checking Gitaly ... Finished


Checking Sidekiq ...


Sidekiq: ... Running? ... yes
Number of Sidekiq processes ... 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 ...


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: ...
1/1 ... yes
1/3 ... yes
1/4 ... yes
1/5 ... yes
1/7 ... yes
1/8 ... yes
1/9 ... yes
1/10 ... yes
1/11 ... yes
1/12 ... yes
1/14 ... yes
1/16 ... yes
1/17 ... yes
1/18 ... yes
1/19 ... yes
1/20 ... yes
19/21 ... yes
19/22 ... yes
18/23 ... yes
19/25 ... yes
19/26 ... yes
19/27 ... yes
19/29 ... yes
19/30 ... yes
18/31 ... yes
18/32 ... yes
19/33 ... yes
18/34 ... yes
19/35 ... yes
19/36 ... yes
19/37 ... yes
19/38 ... yes
3/39 ... yes
19/40 ... yes
18/41 ... yes
19/42 ... yes
19/43 ... yes
19/44 ... yes
18/45 ... yes
18/47 ... yes
18/48 ... yes
19/49 ... yes
19/50 ... yes
1/51 ... yes
22/52 ... yes
19/54 ... yes
19/55 ... yes
18/57 ... yes
19/58 ... yes
20/60 ... yes
26/61 ... yes
19/62 ... yes
19/63 ... yes
19/64 ... yes
18/65 ... yes
19/66 ... yes
18/67 ... yes
19/68 ... yes
22/69 ... yes
19/70 ... yes
30/71 ... yes
19/72 ... yes
19/73 ... yes
19/74 ... yes
18/75 ... yes
18/76 ... yes
30/77 ... yes
18/78 ... yes
30/79 ... yes
2/80 ... yes
19/81 ... yes
18/82 ... yes
19/83 ... yes
18/86 ... yes
18/87 ... yes
34/88 ... yes
1/89 ... yes
19/90 ... yes
19/91 ... yes
19/92 ... yes
34/93 ... yes
34/94 ... yes
34/95 ... yes
34/96 ... yes
34/97 ... yes
41/98 ... yes
34/99 ... yes
34/100 ... yes
34/101 ... yes
34/103 ... yes
51/105 ... yes
51/106 ... yes
51/107 ... yes
51/108 ... yes
51/109 ... yes
18/110 ... yes
19/111 ... yes
49/112 ... yes
34/114 ... yes
18/115 ... yes
26/116 ... yes
26/117 ... yes
26/118 ... yes
26/119 ... yes
26/120 ... yes
19/121 ... yes
56/122 ... yes
56/123 ... yes
56/124 ... yes
56/125 ... yes
58/126 ... yes
58/127 ... yes
Redis version >= 2.8.0? ... yes
Ruby version >= 2.5.3 ? ... yes (2.6.3)
Git version >= 2.21.0 ? ... yes (2.21.0)
Git user has default SSH configuration? ... yes
Active users: ... 24
Elasticsearch version 5.6 - 6.x? ... skipped (elasticsearch is disabled)


Checking GitLab App ... Finished


Checking GitLab subtasks ... Finished

Possible fixes

(If you can, link to the line of code that might be responsible for the problem)