Since on of our recent updates of the jenkins LTS version and all available plugins, git checkout sometimes fail with the following exception:

FATAL: Could not checkout master with start point 94f70933316a337a21037ad791f6015ce7d561e5
hudson.plugins.git.GitException: Could not checkout master with start point 94f70933316a337a21037ad791f6015ce7d561e5
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.checkoutBranch(CliGitAPIImpl.java:1090)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at hudson.remoting.RemoteInvocationHandler$RPCRequest.perform(RemoteInvocationHandler.java:299)
at hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocationHandler.java:280)
at hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocationHandler.java:239)
at hudson.remoting.UserRequest.perform(UserRequest.java:118)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:326)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: hudson.plugins.git.GitException: Result has multiple lines
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.firstLine(CliGitAPIImpl.java:422)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.revParse(CliGitAPIImpl.java:354)
at hudson.plugins.git.GitAPI.revParse(GitAPI.java:255)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.parseBranches(CliGitAPIImpl.java:1024)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.getBranches(CliGitAPIImpl.java:1035)
at hudson.plugins.git.GitAPI.getBranches(GitAPI.java:153)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.checkoutBranch(CliGitAPIImpl.java:1081)
... 16 more

So ar this only happens in multi-configuration projects where we merge cchanges from a branch taht triggered the job back to the master branch. The error seems to occur randomly on one of the configurations, but not on the master job itself.