From cb84fa9d9b5212e54364c1eba4437aa10e0da7f3 Mon Sep 17 00:00:00 2001
From: Rhys Arkins <rhys@arkins.net>
Date: Mon, 22 Jun 2020 20:18:39 +0200
Subject: [PATCH] fix: filter registryUrls for null/undefined

---
 lib/datasource/index.ts | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/lib/datasource/index.ts b/lib/datasource/index.ts
index 2378c230198da3..68cd63b9512783 100644
--- a/lib/datasource/index.ts
+++ b/lib/datasource/index.ts
@@ -131,9 +131,14 @@ function resolveRegistryUrls(
   extractedUrls: string[]
 ): string[] {
   const { defaultRegistryUrls = [], appendRegistryUrls = [] } = datasource;
-  return is.nonEmptyArray(extractedUrls)
-    ? [...extractedUrls, ...appendRegistryUrls]
-    : [...defaultRegistryUrls, ...appendRegistryUrls];
+  const customUrls = extractedUrls?.filter(Boolean);
+  let registryUrls: string[];
+  if (is.nonEmptyArray(customUrls)) {
+    registryUrls = [...extractedUrls, ...appendRegistryUrls];
+  } else {
+    registryUrls = [...defaultRegistryUrls, ...appendRegistryUrls];
+  }
+  return registryUrls.filter(Boolean);
 }
 
 async function fetchReleases(