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When using the `org.keycloak.adapters.servlet.KeycloakOIDCFilter` a `NullPointerException` can be thrown in the `org.keycloak.adapters.servlet.FilterSessionStore` within the `getParam` method of the generated wrapper in `buildWrapper` when the `content-type` is not set. Since the `content-type` is only used to parse the body. We just check whether the `body` is `null` and if so avoid touching the `content-type` which prevents the NPE. If the `body` is null we return an empty `MultivaluedHashMap` for the parameters.