Steps to reproduce bug:
1. Go to Jenkins
2. Click “New Job”
3. Select any build type (I used Build a free-style software project in this case)
4. Set the Job Name to something (I used projectA in this case)
5. Click “OK”
6. Click “Save”
7. You are retuned to host:port/job/ProjectA/
8. Click on “Back to Dashboard”
9. Click on “New Job”
10. Set the Job Name to project
11. Click “Copy existing Job”
12. Type projectA in the “ Copy from” input box
13. Click “OK”
14. Error is shown. Status code 500

Status Code: 500
Exception: java.lang.NullPointerException
Stacktrace:

javax.servlet.ServletException: java.lang.NullPointerException
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:615)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:658)
at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:241)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:573)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:658)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:487)
at org.kohsuke.stapler.Stapler.service(Stapler.java:164)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:45)
at winstone.ServletConfiguration.execute(ServletConfiguration.java:248)
at winstone.RequestDispatcher.forward(RequestDispatcher.java:333)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:376)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:95)
at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:87)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:47)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:50)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at winstone.RequestDispatcher.forward(RequestDispatcher.java:331)
at winstone.RequestHandlerThread.processRequest(RequestHandlerThread.java:215)
at winstone.RequestHandlerThread.run(RequestHandlerThread.java:138)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at java.util.Vector.addAll(Unknown Source)
at hudson.model.AbstractProject.getActions(AbstractProject.java:1110)
at hudson.model.Actionable.getActions(Actionable.java:88)
at hudson.plugins.jobConfigHistory.JobConfigHistoryActionFactory.createFor(JobConfigHistoryActionFactory.java:30)
at hudson.model.AbstractProject.createTransientActions(AbstractProject.java:698)
at hudson.model.Project.createTransientActions(Project.java:206)
at hudson.model.AbstractProject.updateTransientActions(AbstractProject.java:688)
at hudson.model.AbstractProject.save(AbstractProject.java:266)
at hudson.model.Job.onLoad(Job.java:192)
at hudson.model.AbstractProject.onLoad(AbstractProject.java:278)
at hudson.model.Project.onLoad(Project.java:83)
at hudson.model.Items.load(Items.java:221)
at hudson.model.ItemGroupMixIn.copy(ItemGroupMixIn.java:208)
at hudson.model.ItemGroupMixIn.createTopLevelItem(ItemGroupMixIn.java:164)
at jenkins.model.Jenkins.doCreateItem(Jenkins.java:2857)
at jenkins.model.Jenkins.doCreateItem(Jenkins.java:308)
at hudson.model.AllView.doCreateItem(AllView.java:76)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:288)
at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:151)
at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:90)
at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:111)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:573)
... 39 more