diff --git a/bootstrap.php b/bootstrap.php
index 17aaf608..67b9fbaf 100644
--- a/bootstrap.php
+++ b/bootstrap.php
@@ -47,7 +47,9 @@ $conf['b8']['app']['namespace'] = 'PHPCI';
 $conf['b8']['app']['default_controller'] = 'Home';
 $conf['b8']['view']['path'] = dirname(__FILE__) . '/PHPCI/View/';
 
-$config = new b8\Config($conf);
-$config->loadYaml(dirname(__FILE__) . '/PHPCI/config.yml');
+if (file_exists(dirname(__FILE__) . '/PHPCI/config.yml')) {
+    $config = new b8\Config($conf);
+    $config->loadYaml(dirname(__FILE__) . '/PHPCI/config.yml');
+}
 
 require_once(dirname(__FILE__) . '/vars.php');
diff --git a/public/install.php b/public/install.php
index e08e647e..d792bdae 100644
--- a/public/install.php
+++ b/public/install.php
@@ -5,7 +5,7 @@ require_once(dirname(__FILE__) . '/../vars.php');
 $installStage = 'start';
 $formAction = '';
 $config = array();
-$ciUrl = ($_SERVER['HTTPS'] == "on" ? 'https' : 'http') . '://';
+$ciUrl = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == "on" ? 'https' : 'http') . '://';
 $ciUrl .= $_SERVER['HTTP_HOST'];
 $ciUrl .= str_replace('/install.php', '', $_SERVER['REQUEST_URI']);
 
diff --git a/vars.php b/vars.php
index 89a1d81e..5725805e 100644
--- a/vars.php
+++ b/vars.php
@@ -7,7 +7,7 @@ if (!defined('APPLICATION_PATH')) {
 }
 
 // Define our PHPCI_URL, if not already defined:
-if (!defined('PHPCI_URL')) {
+if (!defined('PHPCI_URL') && isset($config)) {
     define('PHPCI_URL', $config->get('phpci.url', '') . '/');
 }