add-user script ends with NPE when username and password are the same

[rsvoboda@rosta-ntb ER5]$ jboss-eap-6.0/bin/add-user.sh 

What type of user do you wish to add? 
 a) Management User (mgmt-users.properties) 
 b) Application User (application-users.properties)
(a): 

Enter the details of the new user to add.
Realm (ManagementRealm) : 
Username : asd
Password : 
Re-enter Password : 
Exception in thread "main" java.lang.NullPointerException
	at org.jboss.as.domain.management.security.state.ErrorState.execute(ErrorState.java:58)
	at org.jboss.as.domain.management.security.AddPropertiesUser.run(AddPropertiesUser.java:117)
	at org.jboss.as.domain.management.security.AddPropertiesUser.main(AddPropertiesUser.java:159)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.jboss.modules.Module.run(Module.java:260)
	at org.jboss.modules.Main.main(Main.java:291)