From 610cae2f57ea834a2e5ee23983b81269b2e236eb Mon Sep 17 00:00:00 2001
From: "Kenneth Benzie (Benie)" <benie@infektor.net>
Date: Thu, 5 Sep 2019 11:20:01 +0100
Subject: [PATCH] Check for tmux session in prompt

Before invoking the `tmux` command to unset the vim pane variable first
check that a `tmux` session exists.
---
 prompt_fresh_setup | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/prompt_fresh_setup b/prompt_fresh_setup
index 04c9b47..ee0a6cb 100644
--- a/prompt_fresh_setup
+++ b/prompt_fresh_setup
@@ -110,9 +110,9 @@ fresh_line_one() {
   fi
 
   # Unset vim/tmux navigate flag to handle C-z and multiple vim jobs.
-  if [[ ! -z "$TMUX" ]]; then
-    tmux set-window-option -u @vim$TMUX_PANE
-  fi
+  [[ ! -z "$TMUX" ]] && \
+    [[ "`tmux show-window-options`" = *"@vim$TMUX_PANE"* ]] && \
+      tmux set-window-option -u @vim$TMUX_PANE
 
   # If a virtualenv is enabled, display it's basename
   if [[ ! -z "$VIRTUAL_ENV" ]]; then