Summary

Trying to upgrade from GitLab 8.8.9 to GitLab 8.9.0, which requires an update to Mattermost.

The update to mattermost seems to be failing on my end with an error that seems to indicate an invalid memory address or nil pointer?

https://docs.gitlab.com/omnibus/gitlab-mattermost/#upgrading-gitlab-mattermost-from-versions-prior-to-8.9

Is there a way I can manually consolidate database users myself via DB updates since at least in my case all users are GitLab users and I can be sure that we can consolidate everyone.

Steps to reproduce

[root@localhost /]# su - mattermost
-sh-4.1$ bash
bash-4.1$ /opt/gitlab/embedded/bin/mattermost -config='/var/opt/gitlab/mattermost/config.json' -upgrade_db_30
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
	panic: interface conversion: interface is runtime.errorString, not string
[signal 0xb code=0x1 addr=0x0 pc=0x78090f]

goroutine 1 [running]:
panic(0xcd1aa0, 0xc820015e40)
	/usr/local/go/src/runtime/panic.go:481 +0x3e6
main.doLoadConfig.func1(0xc820165d48)
	/var/lib/jenkins/jobs/mattermost-platform-release/workspace/src/github.com/mattermost/platform/mattermost.go:73 +0x6f
panic(0xccbec0, 0xc82000e0e0)
	/usr/local/go/src/runtime/panic.go:443 +0x4e9
github.com/mattermost/platform/utils.TestConnection(0xc820082b00)
	/var/lib/jenkins/jobs/mattermost-platform-release/workspace/src/github.com/mattermost/platform/utils/mail.go:82 +0x9f
github.com/mattermost/platform/utils.LoadConfig(0x7ffca76a7851, 0x26)
	/var/lib/jenkins/jobs/mattermost-platform-release/workspace/src/github.com/mattermost/platform/utils/config.go:181 +0x10aa
main.doLoadConfig(0x7ffca76a7851, 0x26, 0x0, 0x0)
	/var/lib/jenkins/jobs/mattermost-platform-release/workspace/src/github.com/mattermost/platform/mattermost.go:76 +0x6a
main.main()
	/var/lib/jenkins/jobs/mattermost-platform-release/workspace/src/github.com/mattermost/platform/mattermost.go:84 +0x43
bash-4.1$