diff --git a/src/ZLogger/AsyncStreamLineMessageWriter.cs b/src/ZLogger/AsyncStreamLineMessageWriter.cs
index 20b890b..d8be469 100644
--- a/src/ZLogger/AsyncStreamLineMessageWriter.cs
+++ b/src/ZLogger/AsyncStreamLineMessageWriter.cs
@@ -63,7 +63,7 @@ public AsyncStreamLineMessageWriter(Stream stream, ZLoggerOptions options)
                 }),
                 _ => throw new ArgumentOutOfRangeException()
             };
-                
+
             this.writeLoop = Task.Run(WriteLoop);
         }
 
@@ -103,7 +103,7 @@ void AppendLine(StreamBufferWriter writer)
             {
                 var span = writer.GetSpan(newLine.Length);
                 newLine.CopyTo(span);
-                writer.Advance(2);
+                writer.Advance(newLine.Length);
             }
         }
 
diff --git a/src/ZLogger/Internal/StreamBufferWriter.cs b/src/ZLogger/Internal/StreamBufferWriter.cs
index e1c7eef..bedc465 100644
--- a/src/ZLogger/Internal/StreamBufferWriter.cs
+++ b/src/ZLogger/Internal/StreamBufferWriter.cs
@@ -88,17 +88,23 @@ public void Flush()
         {
             if (written != 0)
             {
-                // sync writer, ConsolePal does not support async write, use Write(byte[]) API is most primitive.
-                stream.Write(buffer, 0, written);
-                stream.Flush();
-                written = 0;
-
-                if (buffer != defaultBuffer)
+                try
+                {
+                    // sync writer, ConsolePal does not support async write, use Write(byte[]) API is most primitive.
+                    stream.Write(buffer, 0, written);
+                    stream.Flush();
+                }
+                finally
                 {
-                    ArrayPool<byte>.Shared.Return(buffer);
-                    buffer = defaultBuffer;
+                    written = 0;
+
+                    if (buffer != defaultBuffer)
+                    {
+                        ArrayPool<byte>.Shared.Return(buffer);
+                        buffer = defaultBuffer;
+                    }
                 }
             }
         }
     }
-}
\ No newline at end of file
+}