How to receive data from serial port via USB in Unity (able to send but not receive)

Hello, I'm working on a project and I need to receive data from the serial port via USB. I wrote some code and I was able to send data, but every time I try to receive it, Unity crashes or throws errors my way. The SendData(); method works fine, but every time I try to call RecieveData(); Unity crashes. Does anyone know the solution?

Code:

using System.Collections; using System.Collections.Generic; using UnityEngine; using System.IO.Ports; using System.Linq; using System.Text; using System.Threading.Tasks;

public class SerialCommunicationScript : MonoBehaviour { SerialPort port = new SerialPort("COM7", 9600);

 [SerializeField] string str = "data";

 private void Start()
 {
     SerialCommunication();
 }

 private void Update()
 {
     SendData();
     RecieveData();
 }

 void SerialCommunication()
 {
     Debug.Log("*****************************");
     Debug.Log("*Serial Port Emulator *");
     Debug.Log("*****************************");
     Debug.Log("");

     try
     {
         port.Open(); // try-catch block, if port is already opened it throws exception
     }
     catch (System.Exception ex)
     {
         Debug.Log("Error opening serial\n" + ex.Message + "\nExiting program...");
         return;
     }

 }

 private void SendData()
 {
     Debug.Log("Sending: ");
     port.WriteLine(str); // Send string over serial
     System.Threading.Thread.Sleep(2000); // Wait 2 seconds in loop
 }

 private void RecieveData()
 {
     Debug.Log("Recieving: ");
     string data = port.ReadLine();
     Debug.Log(data);
     System.Threading.Thread.Sleep(2000); // Wait 2 seconds in loop
 }

}