diff --git a/bin/app b/bin/app
index 2abe169..5b5d7cf 100755
--- a/bin/app
+++ b/bin/app
@@ -1,14 +1,13 @@
 #!/bin/sh
-set -euC
+set -e
 
 _activate_venv() {
 	. .venv/bin/activate
 }
 
 _venv() {
-	_py_version=${1:-3.12.0}
-
 	case "$1" in
+	"") _skip=false ;;
 	--skip-install)
 		_skip=true
 		shift
@@ -17,9 +16,11 @@ _venv() {
 	esac
 
 	if ! $_skip; then
+		_py_version=${1:-3.12.0}
+
 		pyenv install $_py_version
 
-        #init pyenv
+		#init pyenv
 		export PYENV_ROOT="$HOME/.pyenv"
 		[[ -d $PYENV_ROOT/bin ]] && export PATH="$PYENV_ROOT/bin:$PATH"
 		eval "$(pyenv init -)"
@@ -102,7 +103,7 @@ _main() {
 	fi
 
 	_cmd="${1:-help}"
-	if ! [ -z "$@" ]; then
+	if ! [[ -z "$@" ]]; then
 		shift
 	fi