in queue build will fail if the merge request is merged.

[young40]

Started by upstream project "CCS-Merge-Auto-CI" build number 186
originally caused by:

 Gitlab Merge Request #527 :forkRepo => RC2
Building remotely on 192.168.13.57-Mac (mac) in workspace /Users/jenkins/Public/jenkins/workspace/CCS-Merge-Auto-CI/label/mac
 > git rev-parse --is-inside-work-tree
Fetching changes from 2 remote Git repositories
 > git config forkRepo
Fetching upstream changes from forkRepo
 > git --version
 > git fetch --tags --progress forkRepo +refs/heads/*:refs/remotes/forkRepo/*
 > git config remote.origin.url mainRepo
Fetching upstream changes from mainRepo
using GIT_SSH to set credentials 
 > git fetch --tags --progress mainRepo.git +refs/heads/*:refs/remotes/origin/*
Checking out Revision 6172429b584b6c9604accce41aad674e91c9bbf4 ()
 > git config core.sparsecheckout
 > git checkout -f 6172429b584b6c9604accce41aad674e91c9bbf4
FATAL: Could not checkout null with start point 6172429b584b6c9604accce41aad674e91c9bbf4
hudson.plugins.git.GitException: Could not checkout null with start point 6172429b584b6c9604accce41aad674e91c9bbf4
    at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$8.execute(CliGitAPIImpl.java:1578)
    at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$1.call(RemoteGitImpl.java:153)
    at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$1.call(RemoteGitImpl.java:146)
    at hudson.remoting.UserRequest.perform(UserRequest.java:118)
    at hudson.remoting.UserRequest.perform(UserRequest.java:48)
    at hudson.remoting.Request$2.run(Request.java:328)
    at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: hudson.plugins.git.GitException: Command "git checkout -f 6172429b584b6c9604accce41aad674e91c9bbf4" returned status code 128:
stdout: 
stderr: fatal: reference is not a tree: 6172429b584b6c9604accce41aad674e91c9bbf4

    at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:1406)
    at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:1382)
    at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:1378)
    at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommand(CliGitAPIImpl.java:1092)
    at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommand(CliGitAPIImpl.java:1102)
    at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$8.execute(CliGitAPIImpl.java:1573)
    ... 10 more

I remove our git urls from this log

[zhihuiFan]

the `hudson.plugins.git.GitException: Command "git checkout -f 6172429b584b6c9604accce41aad674e91c9bbf4" returned status code 128: stdout: ' error looks happen often, but unknown why it doesn't get enough attention. @timols do do mind to take a look at this or give any instructions to search for others? looks the bad commit is cached somewhere, if I can workaround the issue by remove the cache, it will be good enough for me.