diff --git a/src/cpp/SingletonManager/CronManager.cpp b/src/cpp/SingletonManager/CronManager.cpp
index 54c5fa3e3..f5c998b9f 100644
--- a/src/cpp/SingletonManager/CronManager.cpp
+++ b/src/cpp/SingletonManager/CronManager.cpp
@@ -175,7 +175,7 @@ PingServerTask::~PingServerTask()
 
 int PingServerTask::run()
 {
-	return 0;
+	//return 0;
 	auto current = Poco::DateTime();
 	if (model::table::NODE_SERVER_GRADIDO_COMMUNITY == mNodeServer->getModel()->getNodeServerType()) {
 		std::string url_port = mNodeServer->getModel()->getUrlWithPort();
diff --git a/src/cpp/lib/DataTypeConverter.cpp b/src/cpp/lib/DataTypeConverter.cpp
index 70ceb8055..a0fe756b1 100644
--- a/src/cpp/lib/DataTypeConverter.cpp
+++ b/src/cpp/lib/DataTypeConverter.cpp
@@ -54,6 +54,29 @@ namespace DataTypeConverter
 			return NUMBER_PARSE_LOGIC_ERROR;
 		}
 	}
+	
+	NumberParseState strToInt(const std::string& input, Poco::UInt64& result)
+	{
+		try {
+			result = stoull(input);
+			return NUMBER_PARSE_OKAY;
+		}
+		catch (const std::invalid_argument& ia)
+		{
+			printf("[strToInt] exception: invalid argument: %s\n", ia.what());
+			return NUMBER_PARSE_INVALID_ARGUMENT;
+		}
+		catch (const std::out_of_range& oor)
+		{
+			printf("[strToInt] exception: out or range: %s\n", oor.what());
+			return NUMBER_PARSE_OUT_OF_RANGE;
+		}
+		catch (const std::logic_error & ler)
+		{
+			printf("[strToInt] exception: logical error: %s\n", ler.what());
+			return NUMBER_PARSE_LOGIC_ERROR;
+		}
+	}
 
 	NumberParseState strToDouble(const std::string& input, double& result)
 	{
diff --git a/src/cpp/lib/DataTypeConverter.h b/src/cpp/lib/DataTypeConverter.h
index d6783c977..f93c40d87 100644
--- a/src/cpp/lib/DataTypeConverter.h
+++ b/src/cpp/lib/DataTypeConverter.h
@@ -27,6 +27,7 @@ namespace DataTypeConverter {
 
 	NumberParseState strToInt(const std::string& input, int& result);
 	NumberParseState strToInt(const std::string& input, unsigned long long& result);
+	NumberParseState strToInt(const std::string& input, Poco::UInt64& result);
 	NumberParseState strToDouble(const std::string& input, double& result);
 
 	MemoryBin* hexToBin(const std::string& hexString);
diff --git a/src/cpp/model/gradido/GroupMemberUpdate.cpp b/src/cpp/model/gradido/GroupMemberUpdate.cpp
index d8e898603..17776c56d 100644
--- a/src/cpp/model/gradido/GroupMemberUpdate.cpp
+++ b/src/cpp/model/gradido/GroupMemberUpdate.cpp
@@ -121,6 +121,8 @@ namespace model {
 					// write new group_id in user table
 					user_model->setGroupId(group_model->getID());
 					user_model->updateIntoDB("group_id", group_model->getID());
+					
+					printf("[GroupMemberUpdate::transactionAccepted] finished\n");
 				}
 			}
 			else {
diff --git a/src/cpp/model/gradido/Transaction.cpp b/src/cpp/model/gradido/Transaction.cpp
index 1935241ed..b5677981a 100644
--- a/src/cpp/model/gradido/Transaction.cpp
+++ b/src/cpp/model/gradido/Transaction.cpp
@@ -307,7 +307,7 @@ namespace model {
 			}
 
 			//getModel()->updateIntoDB("request", )
-
+			printf("[Transaction::sign] reference-count: %d\n", mReferenceCount);
 			return true;
 		}
 
@@ -590,6 +590,7 @@ namespace model {
 		int SendTransactionTask::run()
 		{
 			auto result = mTransaction->runSendTransaction();
+			printf("[SendTransactionTask::run] result: %d\n", result);
 			// delete because of error
 			if (-1 == result) {
 				mTransaction->deleteFromDB();