Fix nil exception when Slack integration is enabled at instance level

Summary

After introducing changes for Slack integration in MR !200657 (merged), a regression was identified where enabling Slack integration at the instance level causes a nil exception due to missing parent record handling.

Problem Statement

When Slack integration is enabled at the instance level, the integration does not have a parent record available. This causes a NoMethodError exception when attempting to access parent.full_path on a nil parent object.

The problematic code:

new_slack_integration.alias = new_integration.parent.full_path

Steps to reproduce

Project

  1. Click New Project
  2. Select Create blank project
  3. Name the project
  4. Select the group (any group)
  5. Private visibility
  6. Uncheck Initialize repository with a README
  7. Click Create project and the error occurs

Group

  1. Click New Group
  2. Select Create group
  3. Give the group a name
  4. Private
  5. Who will be using this group? My company or team
  6. Click Create group
  7. 500: We're sorry, something went wrong on our end

What is the current bug behavior?

After upgrade, creating a new project gives the error:

The form contains the following error:
undefined method `full_path' for nil:NilClass

Creating a new group results in a 500 error image

What is the expected correct behavior?

The project or groups should be successfully created

Relevant logs and/or screenshots

{"severity":"ERROR","time":"2025-08-25T20:14:03.058Z","correlation_id":"##################","meta.caller_id":"ProjectsController#create","meta.feature_category":"groups_and_projects","meta.organization_id":1,"meta.remote_ip":"###.###.###.####","meta.user":"####","meta.user_id":#,"meta.client_id":"user/#","message":"Unable to save project. Error: undefined method `full_path' for nil:NilClass"}

Output of checks

Results of GitLab environment info

Expand for output related to GitLab environment info 
System information
System:		
Current User:	###
Using RVM:	no
Ruby Version:	3.2.8
Gem Version:	3.6.9
Bundler Version:2.7.1
Rake Version:	13.0.6
Redis Version:	7.2.10
Sidekiq Version:7.3.9
Go Version:	unknown

GitLab information
Version:	18.3.0
Revision:	f54d72cc517
Directory:	/opt/gitlab/embedded/service/gitlab-rails
DB Adapter:	PostgreSQL
DB Version:	16.8
URL:		https://#######.com
HTTP Clone URL:	https://#########.com/some-group/some-project.git
SSH Clone URL:	###@#############.com:some-group/some-project.git
Using LDAP:	yes
Using Omniauth:	yes
Omniauth Providers: 

GitLab Shell
Version:	14.44.0
Repository storages:
- default: 	unix:/var/opt/gitlab/gitaly/gitaly.socket
GitLab Shell path:		/opt/gitlab/embedded/service/gitlab-shell

Gitaly
- default Address: 	unix:/var/opt/gitlab/gitaly/gitaly.socket
- default Version: 	18.3.0
- default Git Version: 	2.50.1.gl1

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 >= 14.44.0 ? ... OK (14.44.0)
Running /opt/gitlab/embedded/service/gitlab-shell/bin/gitlab-shell-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: ... Server: ldapmain
LDAP authentication... Success
LDAP users with access to your GitLab server (only showing the first 100 results)
User output sanitized. Found 100 users of 100 limit.


Checking LDAP ... Finished


Checking GitLab App ...


Database config exists? ... yes
Tables are truncated? ... skipped
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... yes
Cable config exists? ... yes
Resque config exists? ... 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: ...
9/2 ... yes
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12/4 ... yes
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371/325 ... yes
371/326 ... yes
5/327 ... yes
9/328 ... yes
13/329 ... yes
371/330 ... yes
371/331 ... yes
13/332 ... yes
484/333 ... yes
9/334 ... yes
Redis version >= 6.2.14? ... yes
Ruby version >= 3.0.6 ? ... yes (3.2.8)
Git user has default SSH configuration? ... yes
Active users: ... 29
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

Patch release information for backports

If the bug fix needs to be backported in a patch release to a version under the maintenance policy, please follow the steps on the patch release runbook for GitLab engineers.

Refer to the internal "Release Information" dashboard for information about the next patch release, including the targeted versions, expected release date, and current status.

High-severity bug remediation

To remediate high-severity issues requiring an internal release for single-tenant SaaS instances, refer to the internal release process for engineers.

Workaround

A workaround for this issue is disabling Slack integrations using the rails console. See this forum post.

Customer issue: terraform-provider-gitlab#6593 (closed) / Sentry issue: https://new-sentry.gitlab.net/organizations/gitlab/issues/1832238

Edited by Rez