From 36d957c4e80536c55240189e885cc0a89edb1783 Mon Sep 17 00:00:00 2001
From: Tim Eisele <Shadowghost@users.noreply.github.com>
Date: Wed, 6 Nov 2024 15:49:13 +0100
Subject: [PATCH] Only split user agent if it can be split (#95)

---
 src/Jellyfin.Plugin.Dlna/Api/DlnaServerController.cs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/Jellyfin.Plugin.Dlna/Api/DlnaServerController.cs b/src/Jellyfin.Plugin.Dlna/Api/DlnaServerController.cs
index e814d37..99630c3 100644
--- a/src/Jellyfin.Plugin.Dlna/Api/DlnaServerController.cs
+++ b/src/Jellyfin.Plugin.Dlna/Api/DlnaServerController.cs
@@ -66,7 +66,12 @@ public ActionResult<string> GetDescriptionXml([FromRoute, Required] string serve
         string? userAgent = Request.Headers.UserAgent;
         if (userAgent is not null)
         {
-            userAgent = userAgent.Substring(0, userAgent.IndexOf('/'));
+            var firstIndexOfSlash = userAgent.IndexOf('/');
+            if (firstIndexOfSlash > 0)
+            {
+                userAgent = userAgent.Substring(0, firstIndexOfSlash);
+            }
+
             useRelativePath = _relativePathUserAgents.Contains(userAgent, StringComparison.Ordinal);
         }