安装bug

public/install.php

@@ -16,6 +16,7 @@ $app = new App();
 if (is_file($app->getRootPath() . '.env') && is_file($app->getRootPath() . 'install.lock')) {
 	header('Location: index.php');exit();
 }
+session('error', 0);
 
 define('ROOT_PATH', $app->getRootPath());
 $action = $app->request->param('action', 'index');
@@ -679,7 +680,7 @@ function session($name, $value = false){
 	if ($name == '') {
 		return false;
 	}
-	if ($value) {
+	if (false !== $value) {
 		$_SESSION[$name] = $value;
 	}else{
 		return isset($_SESSION[$name]) ? $_SESSION[$name] : false;