From 7c7e8e765c06a8af13c1f2662f1c7084c937738a Mon Sep 17 00:00:00 2001
From: Christian Beier <dontmind@freeshell.org>
Date: Fri, 17 Apr 2015 12:31:13 +0200
Subject: [PATCH] Re-add the useful bits of
 9aa9ac59b4cb10bfca93456a3098e348de172d7f.

---
 libvncclient/rfbproto.c  | 4 ++++
 libvncclient/vncviewer.c | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/libvncclient/rfbproto.c b/libvncclient/rfbproto.c
index 721c3ae..e2a583c 100644
--- a/libvncclient/rfbproto.c
+++ b/libvncclient/rfbproto.c
@@ -167,6 +167,10 @@ static void FillRectangle(rfbClient* client, int x, int y, int w, int h, uint32_
 static void CopyRectangle(rfbClient* client, uint8_t* buffer, int x, int y, int w, int h) {
   int j;
 
+  if (client->frameBuffer == NULL) {
+      return;
+  }
+
 #define COPY_RECT(BPP) \
   { \
     int rs = w * BPP / 8, rs2 = client->width * BPP / 8; \
diff --git a/libvncclient/vncviewer.c b/libvncclient/vncviewer.c
index 4f87f01..af0a50b 100644
--- a/libvncclient/vncviewer.c
+++ b/libvncclient/vncviewer.c
@@ -154,6 +154,9 @@ rfbClient* rfbGetClient(int bitsPerSample,int samplesPerPixel,
   /* default: use complete frame buffer */ 
   client->updateRect.x = -1;
  
+  client->frameBuffer = NULL;
+  client->outputWindow = 0;
+ 
   client->format.bitsPerPixel = bytesPerPixel*8;
   client->format.depth = bitsPerSample*samplesPerPixel;
   client->appData.requestedDepth=client->format.depth;