My AI sees player through the walls. How do I fix this?

Questions & Answers
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1

I made an AI that walks around a maze and when it sees the player it starts chasing him but the only problem is that the AI can see the player through the walls

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI; 
public class MazeAI : MonoBehaviour 
{
    GameObject player;

    public NavMeshAgent agent;
    public float range; 

    public Transform centrePoint;

    [SerializeField] float sightRange, attackRange;
    bool playerInSight, playerInAttackRange;

    [SerializeField] LayerMask groundLayer, playerLayer;

    void Start()
    {
        agent = GetComponent<NavMeshAgent>();
        player = GameObject.Find("Player");
    }


    void Update()
    {
        if (agent.remainingDistance <= agent.stoppingDistance) 
        {
            Vector3 point;
            if (RandomPoint(centrePoint.position, range, out point)) 
            {
                Debug.DrawRay(point, Vector3.up, Color.blue, 1.0f); 
                agent.SetDestination(point);
            }
        }

        playerInSight = Physics.CheckSphere(transform.position, sightRange, playerLayer);
        playerInAttackRange = Physics.CheckSphere(transform.position, attackRange, playerLayer);

        if (playerInSight && !playerInAttackRange) Chase();
    }
    bool RandomPoint(Vector3 center, float range, out Vector3 result)
    {

        Vector3 randomPoint = center + Random.insideUnitSphere * range;
        NavMeshHit hit;
        if (NavMesh.SamplePosition(randomPoint, out hit, 1.0f, NavMesh.AllAreas))
        {
            result = hit.position;
            return true;
        }

        result = Vector3.zero;
        return false;
    }

    void Chase()
    {
        agent.SetDestination(player.transform.position);
    }

}
2

So, instead of doing Physics.CheckSphere to check for the player, you can use Physics.Raycast in the direction of your player with sightRange as range, and if the Raycast hits the player, meaning there’s no obstacle in between, you can start the chase.