diff --git a/api/src/main/java/io/kafbat/ui/service/ReactiveAdminClient.java b/api/src/main/java/io/kafbat/ui/service/ReactiveAdminClient.java
index 0efe5e827..b043697c6 100644
--- a/api/src/main/java/io/kafbat/ui/service/ReactiveAdminClient.java
+++ b/api/src/main/java/io/kafbat/ui/service/ReactiveAdminClient.java
@@ -16,6 +16,8 @@
 import io.kafbat.ui.util.MetadataVersion;
 import io.kafbat.ui.util.annotation.KafkaClientInternalsDependant;
 import java.io.Closeable;
+import java.io.PrintWriter;
+import java.io.StringWriter;
 import java.time.Duration;
 import java.time.temporal.ChronoUnit;
 import java.util.ArrayList;
@@ -88,7 +90,6 @@
 import org.apache.kafka.common.quota.ClientQuotaAlteration;
 import org.apache.kafka.common.quota.ClientQuotaEntity;
 import org.apache.kafka.common.quota.ClientQuotaFilter;
-import org.apache.kafka.common.requests.DescribeLogDirsResponse;
 import org.apache.kafka.common.resource.ResourcePatternFilter;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
@@ -192,7 +193,7 @@ private static Mono<ConfigRelatedInfo> extract(AdminClient ac) {
 
   public static Mono<ReactiveAdminClient> create(AdminClient adminClient) {
     Mono<ConfigRelatedInfo> configRelatedInfoMono = ConfigRelatedInfo.extract(adminClient);
-    return configRelatedInfoMono.map(info -> new ReactiveAdminClient(adminClient, configRelatedInfoMono, info));
+    return configRelatedInfoMono.map(info -> new ReactiveAdminClient(adminClient, configRelatedInfoMono, info, null));
   }
 
 
@@ -230,6 +231,23 @@ public static <T> Mono<T> toMono(KafkaFuture<T> future) {
         .publishOn(Schedulers.parallel());
   }
 
+  private record ClosedContext(StackTraceElement[] stackTrace) {
+    @Override
+    public String toString() {
+      // Convert stack trace to a string for logging
+      StringWriter sw = new StringWriter();
+      PrintWriter pw = new PrintWriter(sw);
+      for (StackTraceElement element : stackTrace) {
+        pw.println("\tat " + element);
+      }
+      return sw.toString();
+    }
+
+    static ClosedContext capture() {
+      return new ClosedContext(Thread.currentThread().getStackTrace());
+    }
+  }
+
   //---------------------------------------------------------------------------------
 
   @Getter(AccessLevel.PACKAGE) // visible for testing
@@ -237,16 +255,19 @@ public static <T> Mono<T> toMono(KafkaFuture<T> future) {
   private final Mono<ConfigRelatedInfo> configRelatedInfoMono;
 
   private volatile ConfigRelatedInfo configRelatedInfo;
+  private volatile ClosedContext closedContext;
 
   public Set<SupportedFeature> getClusterFeatures() {
     return configRelatedInfo.features();
   }
 
   public Mono<Set<String>> listTopics(boolean listInternal) {
+    checkClosed();
     return toMono(client.listTopics(new ListTopicsOptions().listInternal(listInternal)).names());
   }
 
   public Mono<Void> deleteTopic(String topicName) {
+    checkClosed();
     return toMono(client.deleteTopics(List.of(topicName)).all());
   }
 
@@ -287,6 +308,8 @@ public Mono<Map<String, List<ConfigEntry>>> getTopicsConfig(Collection<String> t
   }
 
   private Mono<Map<String, List<ConfigEntry>>> getTopicsConfigImpl(Collection<String> topicNames, boolean includeDoc) {
+    checkClosed();
+
     List<ConfigResource> resources = topicNames.stream()
         .map(topicName -> new ConfigResource(ConfigResource.Type.TOPIC, topicName))
         .collect(toList());
@@ -337,6 +360,8 @@ private static Mono<Map<Integer, List<ConfigEntry>>> loadBrokersConfig(AdminClie
    * Return per-broker configs or empty map if broker's configs retrieval not supported.
    */
   public Mono<Map<Integer, List<ConfigEntry>>> loadBrokersConfig(List<Integer> brokerIds) {
+    checkClosed();
+
     return loadBrokersConfig(client, brokerIds);
   }
 
@@ -355,6 +380,8 @@ public Mono<Map<String, TopicDescription>> describeTopics(Collection<String> top
   }
 
   private Mono<Map<String, TopicDescription>> describeTopicsImpl(Collection<String> topics) {
+    checkClosed();
+
     return toMonoWithExceptionFilter(
         client.describeTopics(topics).topicNameValues(),
         UnknownTopicOrPartitionException.class,
@@ -411,6 +438,8 @@ static <K, V> Mono<Map<K, V>> toMonoWithExceptionFilter(Map<K, KafkaFuture<V>> v
 
   public Mono<Map<Integer, Map<String, LogDirDescription>>> describeLogDirs(
       Collection<Integer> brokerIds) {
+    checkClosed();
+
     return toMono(client.describeLogDirs(brokerIds).allDescriptions())
         .onErrorResume(UnsupportedVersionException.class, th -> Mono.just(Map.of()))
         .onErrorResume(ClusterAuthorizationException.class, th -> Mono.just(Map.of()))
@@ -421,6 +450,8 @@ public Mono<Map<Integer, Map<String, LogDirDescription>>> describeLogDirs(
   }
 
   public Mono<ClusterDescription> describeCluster() {
+    checkClosed();
+
     return describeClusterImpl(client, getClusterFeatures());
   }
 
@@ -444,6 +475,8 @@ private static Mono<ClusterDescription> describeClusterImpl(AdminClient client,
   }
 
   public Mono<Void> deleteConsumerGroups(Collection<String> groupIds) {
+    checkClosed();
+
     return toMono(client.deleteConsumerGroups(groupIds).all())
         .onErrorResume(GroupIdNotFoundException.class,
             th -> Mono.error(new NotFoundException("The group id does not exist")))
@@ -452,6 +485,8 @@ public Mono<Void> deleteConsumerGroups(Collection<String> groupIds) {
   }
 
   public Mono<Void> deleteConsumerGroupOffsets(String groupId, String topicName) {
+    checkClosed();
+
     return listConsumerGroupOffsets(List.of(groupId), null)
         .flatMap(table -> {
           // filter TopicPartitions by topicName
@@ -476,6 +511,8 @@ public Mono<Void> createTopic(String name,
                                 int numPartitions,
                                 @Nullable Integer replicationFactor,
                                 Map<String, String> configs) {
+    checkClosed();
+
     var newTopic = new NewTopic(
         name,
         Optional.of(numPartitions),
@@ -486,10 +523,14 @@ public Mono<Void> createTopic(String name,
 
   public Mono<Void> alterPartitionReassignments(
       Map<TopicPartition, Optional<NewPartitionReassignment>> reassignments) {
+    checkClosed();
+
     return toMono(client.alterPartitionReassignments(reassignments).all());
   }
 
   public Mono<Void> createPartitions(Map<String, NewPartitions> newPartitionsMap) {
+    checkClosed();
+
     return toMono(client.createPartitions(newPartitionsMap).all());
   }
 
@@ -511,10 +552,14 @@ public Mono<List<String>> listConsumerGroupNames() {
   }
 
   public Mono<Collection<ConsumerGroupListing>> listConsumerGroups() {
+    checkClosed();
+
     return toMono(client.listConsumerGroups().all());
   }
 
   public Mono<Map<String, ConsumerGroupDescription>> describeConsumerGroups(Collection<String> groupIds) {
+    checkClosed();
+
     return partitionCalls(
         groupIds,
         25,
@@ -529,6 +574,8 @@ public Mono<Map<String, ConsumerGroupDescription>> describeConsumerGroups(Collec
   public Mono<Table<String, TopicPartition, Long>> listConsumerGroupOffsets(List<String> consumerGroups,
                                                                             // all partitions if null passed
                                                                             @Nullable List<TopicPartition> partitions) {
+    checkClosed();
+
     Function<Collection<String>, Mono<Map<String, Map<TopicPartition, OffsetAndMetadata>>>> call =
         groups -> toMono(
             client.listConsumerGroupOffsets(
@@ -560,6 +607,8 @@ public Mono<Table<String, TopicPartition, Long>> listConsumerGroupOffsets(List<S
   }
 
   public Mono<Void> alterConsumerGroupOffsets(String groupId, Map<TopicPartition, Long> offsets) {
+    checkClosed();
+
     return toMono(client.alterConsumerGroupOffsets(
             groupId,
             offsets.entrySet().stream()
@@ -646,6 +695,8 @@ static Set<TopicPartition> filterPartitionsWithLeaderCheck(Collection<TopicDescr
   @KafkaClientInternalsDependant
   @VisibleForTesting
   Mono<Map<TopicPartition, Long>> listOffsetsUnsafe(Collection<TopicPartition> partitions, OffsetSpec offsetSpec) {
+    checkClosed();
+
     if (partitions.isEmpty()) {
       return Mono.just(Map.of());
     }
@@ -672,28 +723,35 @@ Mono<Map<TopicPartition, Long>> listOffsetsUnsafe(Collection<TopicPartition> par
   }
 
   public Mono<Collection<AclBinding>> listAcls(ResourcePatternFilter filter) {
+    checkClosed();
+
     Preconditions.checkArgument(getClusterFeatures().contains(SupportedFeature.AUTHORIZED_SECURITY_ENABLED));
     return toMono(client.describeAcls(new AclBindingFilter(filter, AccessControlEntryFilter.ANY)).values());
   }
 
   public Mono<Void> createAcls(Collection<AclBinding> aclBindings) {
+    checkClosed();
+
     Preconditions.checkArgument(getClusterFeatures().contains(SupportedFeature.AUTHORIZED_SECURITY_ENABLED));
     return toMono(client.createAcls(aclBindings).all());
   }
 
   public Mono<Void> deleteAcls(Collection<AclBinding> aclBindings) {
+    checkClosed();
     Preconditions.checkArgument(getClusterFeatures().contains(SupportedFeature.AUTHORIZED_SECURITY_ENABLED));
     var filters = aclBindings.stream().map(AclBinding::toFilter).collect(Collectors.toSet());
     return toMono(client.deleteAcls(filters).all()).then();
   }
 
   public Mono<Void> updateBrokerConfigByName(Integer brokerId, String name, String value) {
+    checkClosed();
     ConfigResource cr = new ConfigResource(ConfigResource.Type.BROKER, String.valueOf(brokerId));
     AlterConfigOp op = new AlterConfigOp(new ConfigEntry(name, value), AlterConfigOp.OpType.SET);
     return toMono(client.incrementalAlterConfigs(Map.of(cr, List.of(op))).all());
   }
 
   public Mono<Void> deleteRecords(Map<TopicPartition, Long> offsets) {
+    checkClosed();
     var records = offsets.entrySet().stream()
         .map(entry -> Map.entry(entry.getKey(), RecordsToDelete.beforeOffset(entry.getValue())))
         .collect(toMap(Map.Entry::getKey, Map.Entry::getValue));
@@ -701,20 +759,24 @@ public Mono<Void> deleteRecords(Map<TopicPartition, Long> offsets) {
   }
 
   public Mono<Void> alterReplicaLogDirs(Map<TopicPartitionReplica, String> replicaAssignment) {
+    checkClosed();
     return toMono(client.alterReplicaLogDirs(replicaAssignment).all());
   }
 
   public Mono<Map<ClientQuotaEntity, Map<String, Double>>> getClientQuotas(ClientQuotaFilter filter) {
+    checkClosed();
     return toMono(client.describeClientQuotas(filter).entities());
   }
 
   public Mono<Void> alterClientQuota(ClientQuotaAlteration alteration) {
+    checkClosed();
     return toMono(client.alterClientQuotas(List.of(alteration)).all());
   }
 
 
   // returns tp -> list of active producer's states (if any)
   public Mono<Map<TopicPartition, List<ProducerState>>> getActiveProducersState(String topic) {
+    checkClosed();
     return describeTopic(topic)
         .map(td -> client.describeProducers(
                 IntStream.range(0, td.partitions().size())
@@ -731,6 +793,7 @@ public Mono<Map<TopicPartition, List<ProducerState>>> getActiveProducersState(St
   private Mono<Void> incrementalAlterConfig(String topicName,
                                             List<ConfigEntry> currentConfigs,
                                             Map<String, String> newConfigs) {
+    checkClosed();
     var configsToDelete = currentConfigs.stream()
         .filter(e -> e.source() == ConfigEntry.ConfigSource.DYNAMIC_TOPIC_CONFIG) //manually set configs only
         .filter(e -> !newConfigs.containsKey(e.name()))
@@ -748,6 +811,7 @@ private Mono<Void> incrementalAlterConfig(String topicName,
 
   @SuppressWarnings("deprecation")
   private Mono<Void> alterConfig(String topicName, Map<String, String> configs) {
+    checkClosed();
     List<ConfigEntry> configEntries = configs.entrySet().stream()
         .flatMap(cfg -> Stream.of(new ConfigEntry(cfg.getKey(), cfg.getValue())))
         .collect(toList());
@@ -800,8 +864,15 @@ private static <K, V> BiFunction<Map<K, V>, Map<K, V>, Map<K, V>> mapMerger() {
     };
   }
 
+  private void checkClosed() {
+    if (this.closedContext != null) {
+      log.error("AdminClient is already closed at:\n{}", closedContext);
+    }
+  }
+
   @Override
   public void close() {
+    this.closedContext = ClosedContext.capture();
     client.close();
   }
 }