IdentityBrokerException->NullPointerException in RH-SSO on SAML IdP Response

Issue

• Authentication fails

• Log has this exception:

  ERROR [org.keycloak.services.error.KeycloakErrorHandler] (default task-8) Uncaught server error: org.keycloak.broker.provider.IdentityBrokerException: Could not process response from SAML identity provider.
      at org.keycloak.broker.saml.SAMLEndpoint$Binding.handleLoginResponse(SAMLEndpoint.java:469)
      at org.keycloak.broker.saml.SAMLEndpoint$Binding.handleSamlResponse(SAMLEndpoint.java:504)
      at org.keycloak.broker.saml.SAMLEndpoint$Binding.execute(SAMLEndpoint.java:244)
      at org.keycloak.broker.saml.SAMLEndpoint.postBinding(SAMLEndpoint.java:160)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
      at java.lang.reflect.Method.invoke(Unknown Source)
      at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:140)
      ...
  Caused by: java.lang.NullPointerException
      at java.util.regex.Matcher.getTextLength(Unknown Source)
      at java.util.regex.Matcher.reset(Unknown Source)
      at java.util.regex.Matcher.<init>(Unknown Source)
      at java.util.regex.Pattern.matcher(Unknown Source)
      at java.util.regex.Pattern.split(Unknown Source)
      at org.keycloak.broker.provider.util.IdentityBrokerState.encoded(IdentityBrokerState.java:41)
      at org.keycloak.services.resources.IdentityBrokerService.parseEncodedSessionCode(IdentityBrokerService.java:987)
      at org.keycloak.services.resources.IdentityBrokerService.authenticated(IdentityBrokerService.java:497)
      at org.keycloak.broker.saml.SAMLEndpoint$Binding.handleLoginResponse(SAMLEndpoint.java:465)
      ... 74 more