diff --git a/lib/src/model/channel_event.dart b/lib/src/model/channel_event.dart
index 448a972..17410b6 100644
--- a/lib/src/model/channel_event.dart
+++ b/lib/src/model/channel_event.dart
@@ -439,7 +439,7 @@ final class SpinifySubscribe extends SpinifyChannelEvent {
   final bool positioned;
 
   /// Data attached to subscription.
-  final List<int> data;
+  final List<int>? data;
 
   @override
   bool get isConnect => false;
@@ -519,7 +519,7 @@ final class SpinifyConnect extends SpinifyChannelEvent {
   final String? node;
 
   /// Payload of connected push.
-  final List<int> data;
+  final List<int>? data;
 
   @override
   bool get isConnect => true;
diff --git a/lib/src/model/subscription_state.dart b/lib/src/model/subscription_state.dart
index 5d07d06..596c1b3 100644
--- a/lib/src/model/subscription_state.dart
+++ b/lib/src/model/subscription_state.dart
@@ -31,6 +31,7 @@ sealed class SpinifySubscriptionState extends _$SpinifySubscriptionStateBase {
   /// Subscribed
   /// {@macro subscription_state}
   factory SpinifySubscriptionState.subscribed({
+    required List<int>? data,
     DateTime? timestamp,
   }) = SpinifySubscriptionState$Subscribed;
 }
@@ -142,9 +143,13 @@ final class SpinifySubscriptionState$Subscribed
     extends SpinifySubscriptionState {
   /// {@macro subscription_state}
   SpinifySubscriptionState$Subscribed({
+    required this.data,
     DateTime? timestamp,
   }) : super(timestamp: timestamp ?? DateTime.now());
 
+  /// Data
+  final List<int>? data;
+
   @override
   String get type => 'subscribed';
 
diff --git a/lib/src/protobuf/protobuf_codec.dart b/lib/src/protobuf/protobuf_codec.dart
index 87296c8..a481162 100644
--- a/lib/src/protobuf/protobuf_codec.dart
+++ b/lib/src/protobuf/protobuf_codec.dart
@@ -219,9 +219,9 @@ final class ProtobufReplyDecoder extends Converter<pb.Reply, SpinifyReply> {
       event = SpinifyPublication(
         timestamp: DateTime.now(),
         channel: channel,
-        data: push.pub.data,
+        data: push.pub.hasData() ? push.pub.data : const <int>[],
         info: _decodeClientInfo(push.pub.info),
-        offset: push.pub.offset,
+        offset: push.pub.hasOffset() ? push.pub.offset : null,
         tags: push.pub.tags,
       );
     } else if (push.hasJoin()) {
@@ -254,7 +254,7 @@ final class ProtobufReplyDecoder extends Converter<pb.Reply, SpinifyReply> {
         timestamp: DateTime.now(),
         channel: channel,
         recoverable: push.subscribe.recoverable,
-        data: push.subscribe.data,
+        data: push.subscribe.hasData() ? push.subscribe.data : null,
         positioned: push.subscribe.positioned,
         since: (
           offset: push.subscribe.offset,
@@ -289,7 +289,7 @@ final class ProtobufReplyDecoder extends Converter<pb.Reply, SpinifyReply> {
         version: push.connect.version,
         expires: expBool,
         ttl: ttlDT,
-        data: push.connect.data,
+        data: push.connect.hasData() ? push.connect.data : null,
         node: push.connect.node,
         pingInterval: pingInterval,
         sendPong: push.connect.pong == true,
@@ -390,7 +390,7 @@ final class ProtobufReplyDecoder extends Converter<pb.Reply, SpinifyReply> {
               // have the "channel" field - I should fill it in manually
               // by copying the channel from the SubscribeRequest
               channel: '',
-              data: pub.data,
+              data: pub.hasData() ? pub.data : const <int>[],
               info: _decodeClientInfo(pub.info),
               offset: pub.offset,
               tags: pub.tags,
@@ -435,7 +435,7 @@ final class ProtobufReplyDecoder extends Converter<pb.Reply, SpinifyReply> {
         version: connect.version,
         expires: expBool,
         ttl: ttlDT,
-        data: connect.data,
+        data: connect.hasData() ? connect.data : null,
         subs: switch (connect.subs) {
           Map<String, pb.SubscribeResult> map when map.isNotEmpty =>
             <String, SpinifySubscribeResult>{
@@ -494,7 +494,7 @@ final class ProtobufReplyDecoder extends Converter<pb.Reply, SpinifyReply> {
               // have the "channel" field - I should fill it in manually
               // by copying the channel from the SubscribeRequest
               channel: '',
-              data: pub.data,
+              data: pub.hasData() ? pub.data : const <int>[],
               info: _decodeClientInfo(pub.info),
               offset: pub.offset,
               tags: pub.tags,
@@ -506,7 +506,7 @@ final class ProtobufReplyDecoder extends Converter<pb.Reply, SpinifyReply> {
       return SpinifyRPCResult(
         id: id,
         timestamp: now,
-        data: rpc.data,
+        data: rpc.hasData() ? rpc.data : const <int>[],
       );
     } else if (reply.hasRefresh()) {
       final refresh = reply.refresh;
diff --git a/lib/src/spinify_impl.dart b/lib/src/spinify_impl.dart
index 748d5d3..9cb8177 100644
--- a/lib/src/spinify_impl.dart
+++ b/lib/src/spinify_impl.dart
@@ -432,7 +432,7 @@ base mixin SpinifySubscriptionMixin on SpinifyBase, SpinifyCommandMixin {
           ..epoch = event.since.epoch
           ..offset = event.since.offset
           ..onEvent(event)
-          ..setState(SpinifySubscriptionState.subscribed());
+          ..setState(SpinifySubscriptionState.subscribed(data: event.data));
       } else if (event is SpinifyUnsubscribe) {
         // Remove server subscription from the registry on unsubscribe event.
         _serverSubscriptionRegistry.remove(event.channel)
@@ -492,7 +492,7 @@ base mixin SpinifySubscriptionMixin on SpinifyBase, SpinifyCommandMixin {
           ..recoverable = value.recoverable
           ..epoch = value.since.epoch
           ..offset = value.since.offset
-          ..setState(SpinifySubscriptionState.subscribed());
+          ..setState(SpinifySubscriptionState.subscribed(data: value.data));
         // Notify about new publications.
         for (var publication in value.publications) {
           // If publication has wrong channel, fix it.