500 on trying to create token

[0nliner]

I've successfully added a new realm and tried to create a token for my user. However, Keycloak is responding with a 500 error. Maybe it's a bug, or maybe I am doing something wrong. Could you please check this out?

{
  "id": "backend",
  "realm": "backend",
  "sslRequired": "none",
  "enabled": true,
  "eventsEnabled": true,
  "eventsExpiration": 900,
  "adminEventsEnabled": true,
  "adminEventsDetailsEnabled": true,
  "attributes": {
    "adminEventsExpiration": "900"
  },
  "clients": [
    {
      "id": "backend",
      "clientId": "backend",
      "name": "backend",
      "enabled": true,
      "publicClient": true,
      "rootUrl": "http://localhost",
      "adminUrl": "http://localhost",
      "baseUrl": "http://localhost",
      "redirectUris": [
        "http://localhost/*"
      ],
      "webOrigins": [
        "http://localhost"
      ]
    }
  ],
  "users": [
    {
      "id": "chel",
      "email": "vkusnisaharok@gmail.com",
      "username": "chel",
      "enabled": true,
      "emailVerified": true,
      "credentials": [
        {
          "temporary": false,
          "type": "password",
          "value": "keycloak"
        }
      ]
    }
  ]
}

merlin@merlin:~/code/keycloak-compose$ docker compose logs -f keycloak
keycloak-1  | Updating the configuration and installing your custom providers, if any. Please wait.
keycloak-1  | 2024-03-27 09:33:34,324 INFO  [io.qua.dep.QuarkusAugmentor] (main) Quarkus augmentation completed in 9801ms
keycloak-1  | 2024-03-27 09:33:36,480 INFO  [org.keycloak.quarkus.runtime.hostname.DefaultHostnameProvider] (main) Hostname settings: Base URL: <unset>, Hostname: <request>, Strict HTTPS: false, Path: <request>, Strict BackChannel: false, Admin URL: <unset>, Admin: <request>, Port: -1, Proxied: false
keycloak-1  | 2024-03-27 09:33:36,797 WARN  [org.infinispan.CONFIG] (keycloak-cache-init) ISPN000569: Unable to persist Infinispan internal caches as no global state enabled
keycloak-1  | 2024-03-27 09:33:36,894 INFO  [org.infinispan.CONTAINER] (keycloak-cache-init) ISPN000556: Starting user marshaller 'org.infinispan.jboss.marshalling.core.JBossUserMarshaller'
keycloak-1  | 2024-03-27 09:33:39,652 WARN  [io.quarkus.agroal.runtime.DataSources] (JPA Startup Thread) Datasource <default> enables XA but transaction recovery is not enabled. Please enable transaction recovery by setting quarkus.transaction-manager.enable-recovery=true, otherwise data may be lost if the application is terminated abruptly
keycloak-1  | 2024-03-27 09:33:40,971 INFO  [org.keycloak.broker.provider.AbstractIdentityProviderMapper] (main) Registering class org.keycloak.broker.provider.mappersync.ConfigSyncEventListener
keycloak-1  | 2024-03-27 09:33:42,869 INFO  [org.keycloak.quarkus.runtime.storage.legacy.liquibase.QuarkusJpaUpdaterProvider] (main) Initializing database schema. Using changelog META-INF/jpa-changelog-master.xml
keycloak-1  | 
keycloak-1  | UPDATE SUMMARY
keycloak-1  | Run:                        121
keycloak-1  | Previously run:               0
keycloak-1  | Filtered out:                 0
keycloak-1  | -------------------------------
keycloak-1  | Total change sets:          121
keycloak-1  | 
keycloak-1  | 2024-03-27 09:33:47,329 INFO  [org.keycloak.connections.infinispan.DefaultInfinispanConnectionProviderFactory] (main) Node name: node_702661, Site name: null
keycloak-1  | 2024-03-27 09:33:47,557 INFO  [org.keycloak.services] (main) KC-SERVICES0050: Initializing master realm
keycloak-1  | 2024-03-27 09:33:49,726 INFO  [org.keycloak.exportimport.singlefile.SingleFileImportProvider] (main) Full importing from file /opt/keycloak/bin/../data/import/realm_backend.json
keycloak-1  | 2024-03-27 09:33:52,406 INFO  [org.keycloak.exportimport.util.ImportUtils] (main) Realm 'backend' imported
keycloak-1  | 2024-03-27 09:33:52,517 INFO  [org.keycloak.exportimport.singlefile.SingleFileImportProvider] (main) Full importing from file /opt/keycloak/bin/../data/import/realm.json
keycloak-1  | 2024-03-27 09:33:54,197 INFO  [org.keycloak.exportimport.util.ImportUtils] (main) Realm 'grafana' imported
keycloak-1  | 2024-03-27 09:33:54,284 INFO  [org.keycloak.exportimport.dir.DirImportProvider] (main) Importing from directory /opt/keycloak/bin/../data/import
keycloak-1  | 2024-03-27 09:33:54,284 INFO  [org.keycloak.services] (main) KC-SERVICES0030: Full model import requested. Strategy: IGNORE_EXISTING
keycloak-1  | 2024-03-27 09:33:54,285 INFO  [org.keycloak.services] (main) KC-SERVICES0032: Import finished successfully
keycloak-1  | 2024-03-27 09:33:54,428 INFO  [io.quarkus] (main) Keycloak 24.0.1 on JVM (powered by Quarkus 3.8.1) started in 19.722s. Listening on: http://0.0.0.0:8080
keycloak-1  | 2024-03-27 09:33:54,428 INFO  [io.quarkus] (main) Profile dev activated. 
keycloak-1  | 2024-03-27 09:33:54,429 INFO  [io.quarkus] (main) Installed features: [agroal, cdi, hibernate-orm, jdbc-postgresql, keycloak, logging-gelf, micrometer, narayana-jta, reactive-routes, resteasy-reactive, resteasy-reactive-jackson, smallrye-context-propagation, vertx]
keycloak-1  | 2024-03-27 09:33:54,863 INFO  [org.keycloak.services] (main) KC-SERVICES0009: Added user 'admin' to realm 'master'
keycloak-1  | 2024-03-27 09:33:54,866 WARN  [org.keycloak.quarkus.runtime.KeycloakMain] (main) Running the server in development mode. DO NOT use this configuration in production.
keycloak-1  | 2024-03-27 09:40:28,413 ERROR [org.keycloak.services.error.KeycloakErrorHandler] (executor-thread-1) Uncaught server error: java.lang.NullPointerException: Cannot invoke "String.lastIndexOf(int)" because the return value of "org.keycloak.representations.AccessToken.getIssuer()" is null
keycloak-1  |   at org.keycloak.services.resources.admin.AdminRoot.authenticateRealmAdminRequest(AdminRoot.java:170)
keycloak-1  |   at org.keycloak.services.resources.admin.AdminRoot.getRealmsAdmin(AdminRoot.java:218)
keycloak-1  |   at org.keycloak.services.resources.admin.AdminRoot$quarkusrestinvoker$getRealmsAdmin_45154ef53be93bae0f6a8d488a99e593258b537a.invoke(Unknown Source)
keycloak-1  |   at org.jboss.resteasy.reactive.server.handlers.InvocationHandler.handle(InvocationHandler.java:29)
keycloak-1  |   at io.quarkus.resteasy.reactive.server.runtime.QuarkusResteasyReactiveRequestContext.invokeHandler(QuarkusResteasyReactiveRequestContext.java:141)
keycloak-1  |   at org.jboss.resteasy.reactive.common.core.AbstractResteasyReactiveContext.run(AbstractResteasyReactiveContext.java:147)
keycloak-1  |   at io.quarkus.vertx.core.runtime.VertxCoreRecorder$14.runWith(VertxCoreRecorder.java:582)
keycloak-1  |   at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2513)
keycloak-1  |   at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1538)
keycloak-1  |   at org.jboss.threads.DelegatingRunnable.run(DelegatingRunnable.java:29)
keycloak-1  |   at org.jboss.threads.ThreadLocalResettingRunnable.run(ThreadLocalResettingRunnable.java:29)
keycloak-1  |   at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
keycloak-1  |   at java.base/java.lang.Thread.run(Thread.java:840)