Failed to execute command Pipe.EOF

Nov 26, 2013 4:31:58 PM hudson.remoting.Channel$2 handle
SEVERE: Failed to execute command Pipe.EOF(49) (channel qa3)
java.lang.NullPointerException
        at hudson.remoting.ProxyWriter$EOF.execute(ProxyWriter.java:177)
        at hudson.remoting.Channel$2.handle(Channel.java:461)
        at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:60)
Nov 26, 2013 4:31:58 PM hudson.remoting.Channel$2 handle
SEVERE: This command is created here
Command Pipe.EOF(49) created at
        at hudson.remoting.Command.<init>(Command.java:67)
        at hudson.remoting.Command.<init>(Command.java:50)
        at hudson.remoting.ProxyWriter$EOF.<init>(ProxyWriter.java:169)
        at hudson.remoting.ProxyWriter.close(ProxyWriter.java:124)
        at hudson.remoting.ProxyWriter.finalize(ProxyWriter.java:132)
        at java.lang.ref.Finalizer.invokeFinalizeMethod(Native Method)
        at java.lang.ref.Finalizer.runFinalizer(Finalizer.java:101)
        at java.lang.ref.Finalizer.access$100(Finalizer.java:32)
        at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:190)