after upgrading to 1.506 when trying to do a maven release via 
https://wiki.jenkins-ci.org/display/JENKINS/M2+Release+Plugin ver 0.9.1 I 
get this:
Status Code: 500Exception: java.lang.ClassCastException: 
net.sf.json.JSONNull cannot be cast to net.sf.json.JSONObject
Stacktrace: 

javax.servlet.ServletException: java.lang.ClassCastException: 
net.sf.json.JSONNull cannot be cast to net.sf.json.JSONObject
        at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:719)
        at org.kohsuke.stapler.Stapler.invoke(Stapler.java:770)
        at org.kohsuke.stapler.MetaClass$12.dispatch(MetaClass.java:384)
        at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:677)
        at org.kohsuke.stapler.Stapler.invoke(Stapler.java:770)
        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:677)
        at org.kohsuke.stapler.Stapler.invoke(Stapler.java:770)
        at org.kohsuke.stapler.Stapler.invoke(Stapler.java:583)
        at org.kohsuke.stapler.Stapler.service(Stapler.java:214)
        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:48)
        at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
        at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
        at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
        at 
hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
        at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)
        at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
        at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
        at 
org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:50)
        at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
        at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
        at 
hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
        at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
        at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
        at winstone.RequestDispatcher.forward(RequestDispatcher.java:331)
        at 
winstone.RequestHandlerThread.processRequest(RequestHandlerThread.java:227)
        at winstone.RequestHandlerThread.run(RequestHandlerThread.java:150)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
        at java.util.concurrent.FutureTask.run(FutureTask.java:166)
        at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
        at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.ClassCastException: net.sf.json.JSONNull cannot be cast to 
net.sf.json.JSONObject
        at 
org.jvnet.hudson.plugins.m2release.M2ReleaseAction.doSubmit(M2ReleaseAction.java:239)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        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:677)
        ... 42 more

any hints on how to solve this issue?

--
Regards,
Tomek Kaczanowski 

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