From 5b4f54a959bc230985145ed2ca7b5a4ff2784459 Mon Sep 17 00:00:00 2001
From: Bogdan <mynameisbogdan@users.noreply.github.com>
Date: Thu, 5 Oct 2023 02:42:18 +0300
Subject: [PATCH] Prevent NullRef for cases when media covers have nullable
 urls

(cherry picked from commit a26df9e9afa8d925c2ad62c126d4edebec7e4e54)

Closes #2981
---
 src/NzbDrone.Core/MediaCover/MediaCoverProxy.cs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/NzbDrone.Core/MediaCover/MediaCoverProxy.cs b/src/NzbDrone.Core/MediaCover/MediaCoverProxy.cs
index a82c7224d..235d5eafe 100644
--- a/src/NzbDrone.Core/MediaCover/MediaCoverProxy.cs
+++ b/src/NzbDrone.Core/MediaCover/MediaCoverProxy.cs
@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.IO;
 using NzbDrone.Common.Cache;
+using NzbDrone.Common.Extensions;
 using NzbDrone.Common.Http;
 using NzbDrone.Core.Configuration;
 
@@ -30,6 +31,11 @@ public MediaCoverProxy(IHttpClient httpClient, IConfigFileProvider configFilePro
 
         public string RegisterUrl(string url)
         {
+            if (url.IsNullOrWhiteSpace())
+            {
+                return null;
+            }
+
             var hash = url.SHA256Hash();
 
             _cache.Set(hash, url, TimeSpan.FromHours(24));