diff --git a/include/sanity_check.php b/include/sanity_check.php
index b8a5acb1c..f9f6575c8 100755
--- a/include/sanity_check.php
+++ b/include/sanity_check.php
@@ -105,7 +105,7 @@
 						"Please set SELF_URL_PATH to the correct value for your server (possible value: <b>$ref_self_url_path</b>)");
 			}
 
-			if (SELF_URL_PATH != $ref_self_url_path && (!defined('_SKIP_SELF_URL_PATH_CHECKS') || !_SKIP_SELF_URL_PATH_CHECKS)) {
+			if (isset($_SERVER["HTTP_HOST"]) && SELF_URL_PATH != $ref_self_url_path && (!defined('_SKIP_SELF_URL_PATH_CHECKS') || !_SKIP_SELF_URL_PATH_CHECKS)) {
 				array_push($errors,
 					"Please set SELF_URL_PATH to the correct value detected for your server: <b>$ref_self_url_path</b>");
 			}