[CrazY.]

You don't need to check if the player is connected on Ham_Item_Deploy hook.

public Ham_Knife_Deploy_Post(iEnt)
{
    new id = get_pdata_cbase(iEnt, m_pPlayer, 4)
    
    if(g_bBot[id] && g_iBotsWithRandomKnives)
    {
        return
    }

    refreshKnifeModel(id)
}