[keycloak-dev] NPE while getting token through Direct Access Grant

Hi Guys!! I took latest master to verify the fix that Stian delivered to prevent usage of same refresh token.My test code tries getting the access token + Refresh token through direct access grant but fails due to NullPointer exception.Meanwhile I can continue to debug further, but wanted to share the observation to you guys... Will post further if I get any more details... Environment details - I have user federation configured to LDAP and tried to login with a user in ldap. Caused by: java.lang.NullPointerException         at org.keycloak.models.cache.infinispan.DefaultCacheUserProvider.removeUser(DefaultCacheUserProvider.java:272)         at org.keycloak.models.UserFederationManager.deleteInvalidUser(UserFederationManager.java:113)         at org.keycloak.models.UserFederationManager.validateAndProxyUser(UserFederationManager.java:135)         at org.keycloak.models.UserFederationManager.getUserById(UserFederationManager.java:163)         at org.keycloak.models.sessions.infinispan.ClientSessionAdapter.getAuthenticatedUser(ClientSessionAdapter.java:265)         at org.keycloak.authentication.DefaultAuthenticationFlow.processFlow(DefaultAuthenticationFlow.java:116)         at org.keycloak.authentication.AuthenticationProcessor.authenticateOnly(AuthenticationProcessor.java:724)         at org.keycloak.protocol.oidc.endpoints.TokenEndpoint.buildResourceOwnerPasswordCredentialsGrant(TokenEndpoint.java:357)         at org.keycloak.protocol.oidc.endpoints.TokenEndpoint.build(TokenEndpoint.java:110)         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:606)         at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:137)         at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:296)         at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:250)         at org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:140)         at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:109)         at org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:135)         at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:103)         at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:356)