This fixes the tmux launch_msg() error.
@ -27,7 +27,7 @@ if (( $SHLVL == 1 )) && zstyle -t ':omz:plugin:tmux:auto' start; then
if [[ -n "$session" ]]; then
exec tmux attach-session -t "$session"
else
exec tmux new-session "$SHELL -l"
exec tmux new-session
fi