From 0ab53809f0de4a373b7b5c07b3dd20b0667ce2cd Mon Sep 17 00:00:00 2001
From: Ali Tekin <atekin@hilscher.com>
Date: Mon, 4 Dec 2023 11:41:59 +0100
Subject: [PATCH] check if environ function available

---
 plugin/vimux.vim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugin/vimux.vim b/plugin/vimux.vim
index 9d0076e..14083b7 100644
--- a/plugin/vimux.vim
+++ b/plugin/vimux.vim
@@ -195,7 +195,7 @@ function! VimuxTmux(arguments) abort
   if VimuxOption('VimuxDebug')
     echom VimuxOption('VimuxTmuxCommand').' '.a:arguments
   endif
-  if has_key(environ(), 'TMUX')
+  if exists('*environ') && has_key(environ(), 'TMUX') || $TMUX != ''
     return system(VimuxOption('VimuxTmuxCommand').' '.a:arguments)
   else
     throw 'Aborting, because not inside tmux session.'