From 3703a170e77ef6daec0da8ba1c56c8a608d74d93 Mon Sep 17 00:00:00 2001
From: Kukks <evilkukka@gmail.com>
Date: Thu, 13 Jul 2023 14:59:18 +0200
Subject: [PATCH] try fix migration for pos yml

---
 BTCPayServer/Hosting/MigrationStartupTask.cs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/BTCPayServer/Hosting/MigrationStartupTask.cs b/BTCPayServer/Hosting/MigrationStartupTask.cs
index 42936611c..8a7f38146 100644
--- a/BTCPayServer/Hosting/MigrationStartupTask.cs
+++ b/BTCPayServer/Hosting/MigrationStartupTask.cs
@@ -341,9 +341,13 @@ namespace BTCPayServer.Hosting
         {
             var items = new List<ViewPointOfSaleViewModel.Item>();
             var stream = new YamlStream();
+            if (string.IsNullOrEmpty(yaml))
+                return items.ToArray();
+            
             stream.Load(new StringReader(yaml));
 
-            var root = stream.Documents.First().RootNode as YamlMappingNode;
+            if(stream.Documents.FirstOrDefault()?.RootNode is not YamlMappingNode root)
+                return items.ToArray();
             foreach (var posItem in root.Children)
             {
                 var trimmedKey = ((YamlScalarNode)posItem.Key).Value?.Trim();