diff --git a/src/main/java/it/cavallium/TransferServiceImpl.java b/src/main/java/it/cavallium/TransferServiceImpl.java
index f10548a..2516167 100644
--- a/src/main/java/it/cavallium/TransferServiceImpl.java
+++ b/src/main/java/it/cavallium/TransferServiceImpl.java
@@ -411,6 +411,10 @@ public class TransferServiceImpl implements TransferService {
 									}
 							)
 							.last()
+							.onErrorMap(error -> {
+								error.printStackTrace();
+								return new Exception("Error while obtaining source group members: " + error.getLocalizedMessage(), error);
+							})
 							.subscribeOn(Schedulers.boundedElastic())
 							.map(members -> Tuple2.of(clients, members));
 				})
diff --git a/src/main/java/it/cavallium/TransferUtils.java b/src/main/java/it/cavallium/TransferUtils.java
index afb7187..6e58a2f 100644
--- a/src/main/java/it/cavallium/TransferUtils.java
+++ b/src/main/java/it/cavallium/TransferUtils.java
@@ -210,7 +210,7 @@ public class TransferUtils {
 		if (supergroupFullInfo.upgradedFromBasicGroupId == 0 && supergroupFullInfo.upgradedFromMaxMessageId == 0
 				&& supergroupFullInfo.memberCount > 500) {
 			TdApi.Chat info = client
-					.<Chat>send(new TdApi.GetChat(supergroupId))
+					.<Chat>send(new TdApi.GetChat(chatEntityIdToChatId(supergroupId, TChatType.SUPERGROUP)))
 					.flatMap(MonoUtils::orElseThrow)
 					.timeout(Duration.ofMinutes(2))
 					.blockOptional()