From 3d07fa54f41b11ccebb7b80e3b477f77b9ca0a22 Mon Sep 17 00:00:00 2001
From: Jicheng Lu <103353@smsassist.com>
Date: Sun, 31 Aug 2025 20:43:45 -0500
Subject: [PATCH] fix potential null reference

---
 src/Plugins/BotSharp.Plugin.Qdrant/QdrantDb.cs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/Plugins/BotSharp.Plugin.Qdrant/QdrantDb.cs b/src/Plugins/BotSharp.Plugin.Qdrant/QdrantDb.cs
index cd14e375..736ed29f 100644
--- a/src/Plugins/BotSharp.Plugin.Qdrant/QdrantDb.cs
+++ b/src/Plugins/BotSharp.Plugin.Qdrant/QdrantDb.cs
@@ -230,8 +230,13 @@ public class QdrantDb : IVectorDb
         {
             foreach (var item in payload)
             {
+                if (item.Value == null)
+                {
+                    continue;
+                }
+
                 var value = item.Value.DataValue?.ConvertToString();
-                if (value == null || item.Key.IsEqualTo(KnowledgePayloadName.Text))
+                if (string.IsNullOrEmpty(value) || item.Key.IsEqualTo(KnowledgePayloadName.Text))
                 {
                     continue;
                 }