From d79960c0d86ea65ee51701d8940e4af68c644314 Mon Sep 17 00:00:00 2001
From: f-rakete <gh@rak.dev>
Date: Sun, 3 Apr 2022 13:09:58 +0200
Subject: [PATCH] Prevent possible infinite loop on fetchThreads()

---
 fbchat-sharp/API/Client.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fbchat-sharp/API/Client.cs b/fbchat-sharp/API/Client.cs
index 2cf11f0..b3bee84 100644
--- a/fbchat-sharp/API/Client.cs
+++ b/fbchat-sharp/API/Client.cs
@@ -188,7 +188,7 @@ public async Task<List<FB_Thread>> fetchThreads(string thread_location, int? bef
                 else  // End of threads
                     break;
 
-                last_thread_timestamp = threads.LastOrDefault()?.last_message_timestamp;
+                last_thread_timestamp = threads.LastOrDefault(t => t.last_message_timestamp != null)?.last_message_timestamp;
 
                 // FB returns a sorted list of threads
                 if ((before != null && long.Parse(last_thread_timestamp) > before) ||