We upgraded from 2.73.2 to 2.73.3 and get now following error message:

java.lang.NumberFormatException: For input string: "GIT_"
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    at java.lang.Integer.parseInt(Integer.java:580)
    at jenkins.model.IdStrategy$CaseInsensitive.idFromFilename(IdStrategy.java:306)
    at hudson.model.User$AllUsers.scanAll(User.java:1056)
Caused: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:104)
Caused: java.lang.Error
    at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:110)
    at hudson.init.TaskMethodFinder$TaskImpl.run(TaskMethodFinder.java:175)
    at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
    at jenkins.model.Jenkins$7.runTask(Jenkins.java:1090)
    at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:210)
    at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
    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: org.jvnet.hudson.reactor.ReactorException
    at org.jvnet.hudson.reactor.Reactor.execute(Reactor.java:269)
    at jenkins.InitReactorRunner.run(InitReactorRunner.java:47)
    at jenkins.model.Jenkins.executeReactor(Jenkins.java:1124)
    at jenkins.model.Jenkins.<init>(Jenkins.java:929)
    at hudson.model.Hudson.<init>(Hudson.java:86)
    at hudson.model.Hudson.<init>(Hudson.java:82)
    at hudson.WebAppMain$3.run(WebAppMain.java:235)
Caused: hudson.util.HudsonFailedToLoad
    at hudson.WebAppMain$3.run(WebAppMain.java:252)