[keycloak-user] IdentityBrokerState Exception

Hi I have this exception with a client's ADFS IdP integrating with our Keycloak. The exception happens upon login and isn't happening on the staging instance. Caused by: java.lang.NullPointerException at java.base/java.util.regex.Matcher.getTextLength(Matcher. java:1769) at java.base/java.util.regex.Matcher.reset(Matcher.java:416) at java.base/java.util.regex.Matcher.<init>(Matcher.java:253) at java.base/java.util.regex.Pattern.matcher(Pattern.java:1147) at java.base/java.util.regex.Pattern.split(Pattern.java:1264) at org.keycloak.keycloak-server-spi-private//org.keycloak. broker.provider.util.IdentityBrokerState.decode(IdentityBrokerState.java:75) at org.keycloak.keycloak-server-spi-private//org.keycloak. broker.provider.util.IdentityBrokerState.getDecodedState( IdentityBrokerState.java:54) at org.keycloak.keycloak-services//org.keycloak.services.resources. IdentityBrokerService.parseEncodedSessionCode(IdentityBrokerService.java: 958) at org.keycloak.keycloak-services//org.keycloak.services.resources. IdentityBrokerService.authenticated(IdentityBrokerService.java:473) at org.keycloak.keycloak-services//org.keycloak.broker. saml.SAMLEndpoint$Binding.handleLoginResponse(SAMLEndpoint.java:440) ... 63 more Any ideas what this could be? Thanks Rory Hart