Merge Requests API doesn't return pipelines correctly

Summary

I have a MR in project with a pipeline but when I try to get that particular MR from API, it returns null in pipeline key instead of returning info about pipeline. When I restart pipeline manually, after it finishes API returns correct info in pipeline.

Steps to reproduce

Create MR with Pipeline and make API call to get a MR detail, it will contain pipeline as null.

What is the current bug behavior?

Sometimes returns null in pipeline key in API response.

What is the expected correct behavior?

API response should always contain actual real info about pipeline in MR.

Relevant logs and/or screenshots

URL: https://<server>/<group>/<project>/merge_requests/480

API Request: <server>projects/232/merge_requests/480 (project ID is correct)

Restart pipeline manually:

Once pipeline is finished make another API call and the result is OK:

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:	2.4.4p296
Gem Version:	2.7.6
Bundler Version:1.16.2
Rake Version:	12.3.1
Redis Version:	3.2.11
Git Version:	2.17.1
Sidekiq Version:5.1.3
Go Version:	unknown
GitLab information
Version:	11.1.4
Revision:	63daf37
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:	no
GitLab Shell
Version:	7.1.4
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 >= 7.1.4 ? ... OK (7.1.4)
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: ...
3/3 ... ok
3/5 ... ok
3/7 ... ok
7/9 ... ok
3/10 ... ok
10/12 ... ok
3/13 ... ok
13/18 ... ok
36/19 ... ok
3/22 ... ok
31/23 ... ok
3/24 ... ok
13/29 ... ok
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33/40 ... ok
76/42 ... ok
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34/60 ... ok
3/63 ... ok
42/65 ... ok
34/66 ... ok
68/67 ... ok
3/68 ... repository is empty
3/73 ... ok
3/75 ... ok
34/77 ... repository is empty
3/80 ... ok
3/81 ... ok
34/83 ... ok
57/84 ... ok
34/86 ... ok
13/91 ... ok
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13/115 ... ok
3/116 ... ok
34/117 ... ok
13/118 ... ok
42/119 ... ok
3/120 ... ok
57/121 ... repository is empty
57/122 ... ok
34/123 ... ok
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63/128 ... ok
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72/180 ... ok
28/181 ... ok
3/182 ... ok
34/183 ... ok
36/184 ... ok
34/187 ... repository is empty
75/188 ... ok
76/189 ... ok
75/190 ... ok
68/191 ... ok
75/192 ... ok
75/193 ... ok
34/194 ... ok
82/195 ... ok
75/196 ... ok
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82/198 ... ok
83/199 ... ok
36/202 ... ok
76/203 ... ok
36/204 ... ok
3/205 ... ok
57/206 ... ok
4/207 ... ok
75/208 ... ok
82/209 ... ok
82/210 ... ok
83/212 ... ok
34/213 ... ok
34/214 ... ok
75/215 ... ok
36/216 ... ok
4/217 ... ok
3/218 ... ok
75/220 ... ok
85/221 ... ok
36/222 ... ok
75/223 ... ok
82/224 ... ok
82/225 ... ok
82/226 ... ok
34/227 ... ok
75/229 ... ok
76/230 ... ok
36/231 ... ok
36/232 ... ok
34/233 ... ok
34/234 ... ok
34/235 ... ok
36/237 ... ok
82/238 ... ok
36/239 ... ok
36/240 ... ok
3/241 ... ok
75/242 ... ok
4/243 ... ok
82/244 ... ok
36/245 ... ok
34/246 ... ok
3/247 ... repository is empty
34/249 ... ok
3/250 ... ok
3/251 ... repository is empty
82/252 ... ok
82/253 ... ok
83/254 ... ok
85/255 ... ok
82/256 ... ok
91/257 ... ok
34/258 ... ok
3/259 ... ok
4/260 ... ok
76/261 ... ok
76/262 ... ok
36/263 ... ok
75/264 ... ok
68/265 ... ok
3/266 ... ok
3/267 ... ok
83/268 ... ok
83/269 ... ok
3/272 ... ok
83/273 ... ok
3/274 ... ok
68/275 ... ok
34/277 ... ok
68/278 ... ok
36/279 ... ok
36/280 ... ok
36/281 ... ok
3/282 ... ok
13/283 ... ok
99/284 ... ok
85/285 ... ok
68/286 ... ok
36/287 ... ok
36/288 ... ok
82/289 ... ok
91/290 ... ok
36/294 ... ok
36/295 ... ok
36/296 ... ok
85/297 ... ok
3/298 ... ok
36/299 ... ok
68/300 ... ok
36/301 ... ok
13/302 ... ok
3/303 ... ok
3/304 ... ok
36/305 ... ok
3/306 ... ok
104/308 ... ok
36/309 ... ok
42/310 ... ok
34/311 ... ok
105/312 ... ok
105/313 ... ok
3/314 ... ok
36/315 ... ok
105/316 ... ok
36/317 ... ok
8/318 ... ok
7/319 ... ok
36/320 ... ok
3/321 ... ok
104/322 ... ok
3/323 ... ok
3/324 ... ok
3/325 ... ok
36/326 ... ok
36/327 ... ok
99/328 ... ok
3/330 ... ok
3/331 ... ok
3/332 ... ok
36/333 ... ok
36/334 ... ok
3/337 ... ok
3/339 ... ok
3/340 ... ok
3/341 ... ok
36/342 ... ok
105/343 ... ok
105/344 ... ok
36/345 ... ok
91/346 ... ok
36/347 ... ok
29/348 ... ok
36/349 ... ok
36/350 ... ok
3/351 ... ok
34/352 ... ok
104/355 ... ok
3/356 ... ok
3/357 ... ok
3/358 ... ok
34/359 ... ok
3/360 ... ok
36/366 ... ok
34/367 ... repository is empty
57/368 ... ok
3/369 ... ok
104/371 ... ok
83/372 ... ok
61/373 ... ok
61/374 ... ok
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: ...
3/3 ... yes
3/5 ... yes
3/7 ... yes
7/9 ... yes
3/10 ... yes
10/12 ... yes
3/13 ... yes
13/18 ... yes
36/19 ... yes
3/22 ... yes
31/23 ... yes
3/24 ... yes
13/29 ... yes
13/30 ... yes
33/40 ... yes
76/42 ... yes
3/43 ... yes
3/44 ... yes
33/45 ... yes
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34/50 ... yes
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34/60 ... yes
3/63 ... yes
42/65 ... yes
34/66 ... yes
68/67 ... yes
3/68 ... yes
3/73 ... yes
3/75 ... yes
34/77 ... yes
3/80 ... yes
3/81 ... yes
34/83 ... yes
57/84 ... yes
34/86 ... yes
13/91 ... yes
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13/97 ... yes
3/98 ... yes
34/101 ... yes
3/102 ... yes
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13/115 ... yes
3/116 ... yes
34/117 ... yes
13/118 ... yes
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3/120 ... yes
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34/123 ... yes
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63/128 ... yes
36/131 ... yes
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36/139 ... yes
63/140 ... yes
63/142 ... yes
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63/144 ... yes
63/145 ... yes
63/146 ... yes
63/147 ... yes
63/148 ... yes
63/149 ... yes
63/150 ... yes
3/152 ... yes
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34/154 ... yes
3/155 ... yes
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3/157 ... yes
13/159 ... yes
42/160 ... yes
61/161 ... yes
34/162 ... yes
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3/164 ... yes
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28/181 ... yes
3/182 ... yes
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68/191 ... yes
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91/257 ... yes
34/258 ... yes
3/259 ... yes
4/260 ... yes
76/261 ... yes
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36/263 ... yes
75/264 ... yes
68/265 ... yes
3/266 ... yes
3/267 ... yes
83/268 ... yes
83/269 ... yes
3/272 ... yes
83/273 ... yes
3/274 ... yes
68/275 ... yes
34/277 ... yes
68/278 ... yes
36/279 ... yes
36/280 ... yes
36/281 ... yes
3/282 ... yes
13/283 ... yes
99/284 ... yes
85/285 ... yes
68/286 ... yes
36/287 ... yes
36/288 ... yes
82/289 ... yes
91/290 ... yes
36/294 ... yes
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85/297 ... yes
3/298 ... yes
36/299 ... yes
68/300 ... yes
36/301 ... yes
13/302 ... yes
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3/304 ... yes
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104/308 ... yes
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42/310 ... yes
34/311 ... yes
105/312 ... yes
105/313 ... yes
3/314 ... yes
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36/317 ... yes
8/318 ... yes
7/319 ... yes
36/320 ... yes
3/321 ... yes
104/322 ... yes
3/323 ... yes
3/324 ... yes
3/325 ... yes
36/326 ... yes
36/327 ... yes
99/328 ... yes
3/330 ... yes
3/331 ... yes
3/332 ... yes
36/333 ... yes
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3/337 ... yes
3/339 ... yes
3/340 ... yes
3/341 ... yes
36/342 ... yes
105/343 ... yes
105/344 ... yes
36/345 ... yes
91/346 ... yes
36/347 ... yes
29/348 ... yes
36/349 ... yes
36/350 ... yes
3/351 ... yes
34/352 ... yes
104/355 ... yes
3/356 ... yes
3/357 ... yes
3/358 ... yes
34/359 ... yes
3/360 ... yes
36/366 ... yes
34/367 ... yes
57/368 ... yes
3/369 ... yes
104/371 ... yes
83/372 ... yes
61/373 ... yes
61/374 ... yes
Redis version >= 2.8.0? ... yes
Ruby version >= 2.3.5 ? ... yes (2.4.4)
Git version >= 2.9.5 ? ... yes (2.17.1)
Git user has default SSH configuration? ... yes
Active users: ... 38
Checking GitLab ... Finished