Infinite portal loop!

i am having a problem with my portal game.when im teleporting to the second portal it teleports me back to the first one, creating an infinite loop

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class teleport_player : MonoBehaviour
{
    public Transform teleportTarget;
    private Transform player;
    public GameObject thePlayer;
    public GameObject theSelf;
    private Transform self;
    bool canteleport;    
    void OnTriggerEnter(Collider other)
    {
        canteleport = true;

        if (canteleport)
        {
            canteleport = false;
            player = thePlayer.transform;
            self = theSelf.transform;
            thePlayer.transform.position = teleportTarget.transform.position;
            if (teleportTarget.rotation.y == self.rotation.y )
            thePlayer.transform.rotation = Quaternion.Euler(player.rotation.eulerAngles.x, teleportTarget.rotation.eulerAngles.y - 180, player.rotation.eulerAngles.z);
            new WaitForSeconds(1);
            canteleport = true;
        }
       
    }
}

Following code not tested:

using UnityEngine;

public class teleport_player : MonoBehaviour
{
    public Transform teleportTarget;

    // Static so that all teleporters share the same value
    private static float lastTeleportationTime;

    void OnTriggerEnter(Collider other)
    {
        if(Time.time - lastTeleportationTime < 5) // Delay of 5 seconds to prevent infinite loops
            return ;

        Transform player = other.transform;

        player.position = teleportTarget.position;
        if ( Mathf.Approximately(teleportTarget.eulerAngles.y, transform.eulerAngles.y) )
            player.Rotate(0, 180, 0);

        lastTeleportationTime = Time.time;
    }
}