Не работает скрипт.

[NoWebGlMan]

Скрипт:

using UnityEngine;

public class WeaponSwitcher : MonoBehaviour {



public BaseWeapon cur_weapon;

public BaseWeapon[] collection;
public BaseWeaponSlot _base;
public SecondaryWeaponSlot _pistol;

public string bs_name;
public string scnr_name;

private int cur_slot = 1;

void OnEnable()
{
WeaponPickUp(bs_name);
WeaponPickUp(scnr_name);
}

void WeaponPickUp(string tag)
{

foreach (BaseWeapon wpn in collection)
{

int i = 0;

if (wpn.tag == tag)
{

Debug.Log("Good weapon: " + wpn.tag);

if (wpn is BaseWeaponSlot) { PickUpBaseCheck(); wpn.IsPresent = true; collection[i] = _base; CallIsActive(); }
if (wpn is SecondaryWeaponSlot) { PickUpPistolCheck(); wpn.IsPresent = true; collection[i] = _pistol; CallIsActive(); }

}
else
{
Debug.Log("Bad weapon has detected " + wpn.tag);
wpn.IsPresent = false;
wpn.IsActive();
}



i++;

}
}



void FixedUpdate()
{

if (Input.GetKeyDown(KeyCode.Alpha1)) { cur_slot = 1; }
if (Input.GetKeyDown(KeyCode.Alpha2)) { cur_slot = 2; }


if (cur_slot == 1) { _base.IsPresent = true; _pistol.IsPresent = false; CallIsActive(); cur_weapon = _base; }
if (cur_slot == 2) { _base.IsPresent = false; _pistol.IsPresent = true; CallIsActive(); cur_weapon = _pistol; }

}

void PickUpBaseCheck()
{
if (_base != null) { _base.IsPresent = false; }
}

void PickUpPistolCheck()
{
if (_pistol != null) { _pistol.IsPresent = false; }
}

void CallIsActive()
{
if (_base != null) { _base.IsActive(); }
if (_pistol != null) { _pistol.IsActive(); }

}

}

// В логе говорится NullReferenceException: Object reference not set to an instance of an object
WeaponSwitcher.WeaponPickUp (System.String tag) (at Assets/Game/Weapon/Script/WeaponSwitcher.cs:32)
WeaponSwitcher.OnEnable () (at Assets/Game/Weapon/Script/WeaponSwitcher.cs:21) Нужно что бы скрипт работал при не наличии оружия, но увы, не работает.