From 1f287dc9c54fc1c59afa798ea7e4f7966e32228d Mon Sep 17 00:00:00 2001
From: Julian Smart <julian@anthemion.co.uk>
Date: Tue, 22 Apr 2014 16:24:31 +0000
Subject: [PATCH] Don't Sync() if there is no buffer. This allows derived
 classes that handle the buffer differently (e.g. reuse the buffer).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76388 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 src/common/stream.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/common/stream.cpp b/src/common/stream.cpp
index fd50f8beac..3dcf8a0c84 100644
--- a/src/common/stream.cpp
+++ b/src/common/stream.cpp
@@ -1488,8 +1488,11 @@ wxFileOffset wxBufferedOutputStream::TellO() const
 
 void wxBufferedOutputStream::Sync()
 {
-    m_o_streambuf->FlushBuffer();
-    m_parent_o_stream->Sync();
+    if (m_o_streambuf)
+    {
+        m_o_streambuf->FlushBuffer();
+        m_parent_o_stream->Sync();
+    }
 }
 
 size_t wxBufferedOutputStream::OnSysWrite(const void *buffer, size_t bufsize)