Getting NullPointerException during login with LDAP on RH-SSO 7.5

Issue

• After update to RH-SSO 7.5 the following error is thrown when trying to login:

ERROR [org.keycloak.broker.oidc.AbstractOAuth2IdentityProvider] (default task-1) Failed to make identity provider oauth callback: java.lang.NullPointerException
    at org.keycloak.storage.ldap.LDAPStorageProvider.importUserFromLDAP(LDAPStorageProvider.java:528)
    at org.keycloak.storage.ldap.LDAPStorageProvider.getUserByUsername(LDAPStorageProvider.java:513)
    at org.keycloak.storage.ldap.LDAPStorageProvider.getUserById(LDAPStorageProvider.java:334)
    at org.keycloak.storage.UserStorageManager.getUserById(UserStorageManager.java:287)
    at org.keycloak.storage.UserStorageManager.getUserByFederatedIdentity(UserStorageManager.java:636)
    at org.keycloak.services.resources.IdentityBrokerService.authenticated(IdentityBrokerService.java:539)
    at org.keycloak.broker.oidc.AbstractOAuth2IdentityProvider$Endpoint.authResponse(AbstractOAuth2IdentityProvider.java:514)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:138)
    at org.jboss.resteasy.core.ResourceMethodInvoker.internalInvokeOnTarget(ResourceMethodInvoker.java:546)
    at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTargetAfterFilter(ResourceMethodInvoker.java:435)
    at org.jboss.resteasy.core.ResourceMethodInvoker.lambda$invokeOnTarget$0(ResourceMethodInvoker.java:396)
    at org.jboss.resteasy.core.interception.PreMatchContainerRequestContext.filter(PreMatchContainerRequestContext.java:358)
    at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:398)
...