2 files changed, 7 insertions, 2 deletions
diff --git a/Jellyfin.Api/Helpers/MediaInfoHelper.cs b/Jellyfin.Api/Helpers/MediaInfoHelper.cs
index df37d96c6..5910d8073 100644
--- a/Jellyfin.Api/Helpers/MediaInfoHelper.cs
+++ b/Jellyfin.Api/Helpers/MediaInfoHelper.cs
@@ -200,7 +200,7 @@ public class MediaInfoHelper
             options.SubtitleStreamIndex = subtitleStreamIndex;
         }
 
-        var user = _userManager.GetUserById(userId);
+        var user = _userManager.GetUserById(userId) ?? throw new ResourceNotFoundException();
 
         if (!enableDirectPlay)
         {
diff --git a/Jellyfin.Api/Helpers/RequestHelpers.cs b/Jellyfin.Api/Helpers/RequestHelpers.cs
index 3ce2b834d..0b7a4fa1a 100644
--- a/Jellyfin.Api/Helpers/RequestHelpers.cs
+++ b/Jellyfin.Api/Helpers/RequestHelpers.cs
@@ -81,6 +81,11 @@ public static class RequestHelpers
         }
 
         var user = userManager.GetUserById(userId);
+        if (user is null)
+        {
+            throw new ResourceNotFoundException();
+        }
+
         return user.EnableUserPreferenceAccess;
     }
 
@@ -98,7 +103,7 @@ public static class RequestHelpers
 
         if (session is null)
         {
-            throw new ArgumentException("Session not found.");
+            throw new ResourceNotFoundException("Session not found.");
         }
 
         return session;