After Applying Fuse 6.3 Rollup 4, I Cannot Log Out of the Karaf Client Shell

Issue

After applying the Rollup 4 patch to my fabric environment, I cannot log out from the karaf shell started from an ssh session or client script. When I type the exit command, I receive the following error:

> exit
Error executing command: Invalid null input: name

Looking in my log, I see a stack trace like this one:

javax.security.auth.login.LoginException: Invalid null input: name
    at javax.security.auth.login.LoginContext.init(LoginContext.java:238)[:1.8.0_144]
    at javax.security.auth.login.LoginContext.<init>(LoginContext.java:381)[:1.8.0_144]
    at javax.security.auth.login.LoginContext.<init>(LoginContext.java:458)[:1.8.0_144]
    at org.apache.karaf.shell.commands.LogoutAction.doExecute(LogoutAction.java:60)
    at org.apache.karaf.shell.console.AbstractAction.execute(AbstractAction.java:33)
    at org.apache.felix.gogo.commands.basic.AbstractCommand.execute(AbstractCommand.java:35)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[:1.8.0_144]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)[:1.8.0_144]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[:1.8.0_144]
    at java.lang.reflect.Method.invoke(Method.java:498)[:1.8.0_144]
    at org.apache.aries.proxy.impl.ProxyHandler$1.invoke(ProxyHandler.java:54)
    at org.apache.aries.proxy.impl.ProxyHandler.invoke(ProxyHandler.java:119)
    at org.apache.karaf.shell.console.commands.$BlueprintCommand310717754.execute(Unknown Source)[38:org.apache.karaf.shell.console:2.4.0.redhat-630283]
    at org.apache.felix.gogo.runtime.CommandProxy.execute(CommandProxy.java:78)[38:org.apache.karaf.shell.console:2.4.0.redhat-630283]
    at org.apache.felix.gogo.runtime.Closure.executeCmd(Closure.java:477)[38:org.apache.karaf.shell.console:2.4.0.redhat-630283]
    at org.apache.felix.gogo.runtime.Closure.executeStatement(Closure.java:403)[38:org.apache.karaf.shell.console:2.4.0.redhat-630283]
    at org.apache.felix.gogo.runtime.Pipe.run(Pipe.java:108)[38:org.apache.karaf.shell.console:2.4.0.redhat-630283]
    at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:183)[38:org.apache.karaf.shell.console:2.4.0.redhat-630283]
    at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:120)[38:org.apache.karaf.shell.console:2.4.0.redhat-630283]
    at org.apache.felix.gogo.runtime.Closure.executeCmd(Closure.java:477)[38:org.apache.karaf.shell.console:2.4.0.redhat-630283]
    at org.apache.felix.gogo.runtime.Closure.executeStatement(Closure.java:403)[38:org.apache.karaf.shell.console:2.4.0.redhat-630283]
    at org.apache.felix.gogo.runtime.Pipe.run(Pipe.java:108)[38:org.apache.karaf.shell.console:2.4.0.redhat-630283]
    at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:183)[38:org.apache.karaf.shell.console:2.4.0.redhat-630283]
    at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:120)[38:org.apache.karaf.shell.console:2.4.0.redhat-630283]
    at org.apache.felix.gogo.runtime.CommandSessionImpl.execute(CommandSessionImpl.java:92)
    at org.apache.karaf.shell.console.jline.Console.run(Console.java:197)
    at org.apache.karaf.shell.ssh.ShellFactoryImpl$ShellImpl$1.runConsole(ShellFactoryImpl.java:171)[155:org.apache.karaf.shell.ssh:2.4.0.redhat-630283]
    at org.apache.karaf.shell.ssh.ShellFactoryImpl$ShellImpl$1$1.run(ShellFactoryImpl.java:126)
    at java.security.AccessController.doPrivileged(Native Method)[:1.8.0_144]
    at org.apache.karaf.jaas.modules.JaasHelper.doAs(JaasHelper.java:47)[25:org.apache.karaf.jaas.modules:2.4.0.redhat-630283]
    at org.apache.karaf.shell.ssh.ShellFactoryImpl$ShellImpl$1.run(ShellFactoryImpl.java:124)[155:org.apache.karaf.shell.ssh:2.4.0.redhat-630283]