diff --git a/BTCPayServer/Services/LanguageService.cs b/BTCPayServer/Services/LanguageService.cs
index da88f25b1..a156b64ad 100644
--- a/BTCPayServer/Services/LanguageService.cs
+++ b/BTCPayServer/Services/LanguageService.cs
@@ -53,6 +53,8 @@ namespace BTCPayServer.Services
 
         public Language FindLanguageInAcceptLanguageHeader(string acceptLanguageHeader)
         {
+            if (acceptLanguageHeader is null)
+                return null;
             IDictionary<string, float> acceptedLocales = new Dictionary<string, float>();
             var locales = acceptLanguageHeader.Split(',', StringSplitOptions.RemoveEmptyEntries);
             for (int i = 0; i < locales.Length; i++)
diff --git a/Changelog.md b/Changelog.md
index a268a152e..71db058cf 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -11,6 +11,7 @@
 * Lightning payments should not be proposed for top-up invoices (#2772, #2780) @ubolator
 * Typo fixes (#2774) @jorisvial
 * Fix payjoin client to properly handle receiver using output substitution (#2677) @NicolasDorier
+* The checkout would crash for some client if automatic detection of language was checked, and the browser was not setting the accepted language @NicolasDorier
 
 ## 1.2.1