Summary

we use the gitlab omnibus package and want to use mattermost. We set up mattermost and gitlab on same host with two different DNS-Names. Both running on HTTPS.

After a short test with some developers we try to clean up and delete some empty teams called "test" or "Admin".
If I try to delete the teams with

 sudo -u mattermost ./mattermost -config=/var/opt/gitlab/mattermost/config.json team delete Admin

here you see command and Error out put

sudo -u mattermost ./mattermost -config=/var/opt/gitlab/mattermost/config.json team delete Admin
Have you performed a database backup? (YES/NO):
YES
Are you sure you want to delete the teams specified?  All data will be permanently deleted? (YES/NO):
YES
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x416488]

goroutine 1 [running]:
panic(0xbde860, 0xc4200100c0)
        /usr/local/go/src/runtime/panic.go:500 +0x1a1
main.getTeamFromTeamArg(0x7ffc3f3918e4, 0x5, 0x1)
        /var/lib/jenkins/jobs/msr/jobs/platform-release/workspace/src/github.com/mattermost/platform/cmd/platform/teamargs.go:21 +0x28
main.getTeamsFromTeamArgs(0xc4200cd3c0, 0x1, 0x2, 0x3, 0x1, 0x0)
        /var/lib/jenkins/jobs/msr/jobs/platform-release/workspace/src/github.com/mattermost/platform/cmd/platform/teamargs.go:13 +0xa2
main.deleteTeamsCmdF(0x106b700, 0xc4200cd3c0, 0x1, 0x2, 0x0, 0x0)
        /var/lib/jenkins/jobs/msr/jobs/platform-release/workspace/src/github.com/mattermost/platform/cmd/platform/team.go:187 +0xdf
github.com/mattermost/platform/vendor/github.com/spf13/cobra.(*Command).execute(0x106b700, 0xc4200cd1a0, 0x2, 0x2, 0x106b700, 0xc4200cd1a0)
        /var/lib/jenkins/jobs/msr/jobs/platform-release/workspace/src/github.com/mattermost/platform/vendor/github.com/spf13/cobra/command.go:632 +0x23e
github.com/mattermost/platform/vendor/github.com/spf13/cobra.(*Command).ExecuteC(0xc4200986c0, 0x0, 0x0, 0x0)
        /var/lib/jenkins/jobs/msr/jobs/platform-release/workspace/src/github.com/mattermost/platform/vendor/github.com/spf13/cobra/command.go:722 +0x367
github.com/mattermost/platform/vendor/github.com/spf13/cobra.(*Command).Execute(0xc4200986c0, 0xc42010ea40, 0xb)
        /var/lib/jenkins/jobs/msr/jobs/platform-release/workspace/src/github.com/mattermost/platform/vendor/github.com/spf13/cobra/command.go:681 +0x2b
main.main()
        /var/lib/jenkins/jobs/msr/jobs/platform-release/workspace/src/github.com/mattermost/platform/cmd/platform/mattermost.go:50 +0x49f

I got the same error when calling other command like team add Admin username