From 72dec0b203f47952a3f9bd4b68fce22dc4956342 Mon Sep 17 00:00:00 2001
From: sakno <roman.sakno@gmail.com>
Date: Wed, 4 Dec 2024 20:55:26 +0200
Subject: [PATCH] Fixed corner case when the internal buffer is empty

---
 src/DotNext/Buffers/BufferWriterSlim.cs | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/DotNext/Buffers/BufferWriterSlim.cs b/src/DotNext/Buffers/BufferWriterSlim.cs
index 7ef68984c..8443bdddc 100644
--- a/src/DotNext/Buffers/BufferWriterSlim.cs
+++ b/src/DotNext/Buffers/BufferWriterSlim.cs
@@ -309,7 +309,13 @@ public bool TryDetachBuffer(out MemoryOwner<T> owner)
     public MemoryOwner<T> DetachOrCopyBuffer()
     {
         MemoryOwner<T> result;
-        if (NoOverflow)
+
+        if (position is 0)
+        {
+            result = default;
+            goto exit;
+        }
+        else if (NoOverflow)
         {
             result = allocator.AllocateExactly(position);
             initialBuffer.CopyTo(result.Span);
@@ -319,9 +325,11 @@ public MemoryOwner<T> DetachOrCopyBuffer()
             result = extraBuffer;
             extraBuffer = default;
         }
-        
+
         result.Truncate(position);
         position = 0;
+
+        exit:
         return result;
     }