From bd8f72daab4a4afc6d8aa4583bba728da071264f Mon Sep 17 00:00:00 2001
From: Andreas Fuchs <info@anfuchs.de>
Date: Thu, 6 May 2021 10:04:37 +0200
Subject: [PATCH] fixes #649

prevents crashes if NULL is entered as a referrer in the database. Does not guard against submitting NULL to the database.
---
 lib/filters.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/filters.js b/lib/filters.js
index 1c0e7916..733dab94 100644
--- a/lib/filters.js
+++ b/lib/filters.js
@@ -51,7 +51,7 @@ export const refFilter = (data, { domain, domainOnly, raw }) => {
   const links = {};
 
   const isValidRef = ref => {
-    return ref !== '' && !ref.startsWith('/') && !ref.startsWith('#');
+    return ref !== '' && ref !== null && !ref.startsWith('/') && !ref.startsWith('#');
   };
 
   if (raw) {