How to open laravel .env file with Vim CtrlP plugin?

Question

I am using vim with CtrlP plugin for browsing laravel application. The problem is that CtrlP working fine for browsing other .(dot) such as .env.example or .gitignore files except for .env file of laravel.

Here CtrlP working for .env.example file

and here it's working for .gitignore file

This is my CtrlP specific configuration from .vimrc

let g:ctrlp_extensions = ['buffertag']

nmap <c-R> :CtrlPBufTag<cr>

set wildignore+=*/vendor/**,*/node_modules/**
set wildignore+=*/public/forum/**
let g:ctrlp_user_command = ['.git/', 'git --git-dir=%s/.git ls-files -oc --exclude-standard']
let g:ctrlp_match_window='order:ttb,min:1,max:15,result:15'