java.lang.NullPointerException
        at com.jcraft.jsch.Session.disconnect(Session.java:0)
        at org.netbeans.modules.versioning.system.cvss.SSHConnection.close(SSHConnection.java:162)
        at org.netbeans.modules.versioning.system.cvss.CommandRunnable.run(CommandRunnable.java:102)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997)