diff --git a/src/main/java/it/tdlight/tdlibsession/SignalMessageCodec.java b/src/main/java/it/tdlight/tdlibsession/SignalMessageCodec.java
index 2feba1c..8b000da 100644
--- a/src/main/java/it/tdlight/tdlibsession/SignalMessageCodec.java
+++ b/src/main/java/it/tdlight/tdlibsession/SignalMessageCodec.java
@@ -63,10 +63,8 @@ public class SignalMessageCodec<T> implements MessageCodec<SignalMessage<T>, Sig
 					case 0x01:
 						return SignalMessage.onNext(typeCodec.decodeFromWire(pos + 1, buffer));
 					case 0x02:
-						var size = buffer.getInt(pos + 1);
-						return SignalMessage.onDecodedError(new String(buffer.getBytes(pos + 2, pos + 2 + size),
-								StandardCharsets.UTF_8
-						));
+						var size = dis.readInt();
+						return SignalMessage.onDecodedError(new String(dis.readNBytes(size), StandardCharsets.UTF_8));
 					case 0x03:
 						return SignalMessage.onComplete();
 					default:
diff --git a/src/main/java/it/tdlight/tdlibsession/td/direct/AsyncTdDirectImpl.java b/src/main/java/it/tdlight/tdlibsession/td/direct/AsyncTdDirectImpl.java
index 6f6f57b..3d06629 100644
--- a/src/main/java/it/tdlight/tdlibsession/td/direct/AsyncTdDirectImpl.java
+++ b/src/main/java/it/tdlight/tdlibsession/td/direct/AsyncTdDirectImpl.java
@@ -17,6 +17,7 @@ import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 import reactor.core.publisher.Sinks;
 import reactor.core.publisher.Sinks.One;
+import reactor.core.scheduler.Scheduler;
 import reactor.core.scheduler.Schedulers;
 
 public class AsyncTdDirectImpl implements AsyncTdDirect {
@@ -24,6 +25,7 @@ public class AsyncTdDirectImpl implements AsyncTdDirect {
 	private static final Logger logger = LoggerFactory.getLogger(AsyncTdDirect.class);
 
 	private final One<TelegramClient> td = Sinks.one();
+	private final Scheduler tdScheduler = Schedulers.single();
 
 	private final String botAlias;
 
@@ -43,7 +45,7 @@ public class AsyncTdDirectImpl implements AsyncTdDirect {
 					}
 					throw new IllegalStateException("TDLib client is destroyed");
 				}
-			}).publishOn(Schedulers.boundedElastic()).single());
+			}).publishOn(Schedulers.boundedElastic()).single().subscribeOn(tdScheduler));
 		} else {
 			return td.asMono().flatMap(td -> Mono.<TdResult<T>>create(sink -> {
 				if (td != null) {
@@ -58,7 +60,7 @@ public class AsyncTdDirectImpl implements AsyncTdDirect {
 					}
 					sink.error(new IllegalStateException("TDLib client is destroyed"));
 				}
-			})).single();
+			})).single().subscribeOn(tdScheduler);
 		}
 	}
 
@@ -89,6 +91,6 @@ public class AsyncTdDirectImpl implements AsyncTdDirect {
 						ex -> logger.trace("Error when disposing td client", ex)
 				))).subscribe();
 			});
-		});
+		}).subscribeOn(tdScheduler);
 	}
 }