How to prevent application from closing after multiple publish received?

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.NET

C#6.0

mqtt

I have created the console application which subscribes to multiple topics to the MQTT Broker. I have registered MqttMsgPublishedReceived even which triggers whenever there is a new data on the subscribed topic. The application is running properly for a single subscription. But when I tried to run the multiple subscriptions, the application is closing. How to make the MqttMsgPublisheReceived event to handle the multiple publishes. Below is my code snippet.
i followed following code

for(int i=0;i<client.Length;i++)

{

subscribe(hostname,port,clientid);<pre>

}

public void subscribe()

{

 client.MqttMsgPublishReceived+=client_MqttMsgPublishReceived
<pre>}

public void client_MqttPublishReceived(object sender,MqttMsgPublishEventargs e)

{

//business logic

}

MqttMsgPublishReceived event crashing for simulataneous messages. Thanks in advance

What I have tried:

I tried calling individually each topic.For which applcation properly. It is crashing whenever i run multiple applications.