From 16ea5e04147f77ad9bee6aa96b6875df63a035a4 Mon Sep 17 00:00:00 2001
From: Dmitry Kravtsov <idkravitz@gmail.com>
Date: Thu, 25 Oct 2012 14:48:57 +1100
Subject: [PATCH] Bugfix: Uploading of partialy uploaded Geometry

When Geometry is uploaded, one can add new VertexStream,
which would cause a Runtime error during next upload (null reference)
---
 src/alternativa/engine3d/resources/Geometry.as | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/alternativa/engine3d/resources/Geometry.as b/src/alternativa/engine3d/resources/Geometry.as
index 43ff5eb..6feab16 100644
--- a/src/alternativa/engine3d/resources/Geometry.as
+++ b/src/alternativa/engine3d/resources/Geometry.as
@@ -652,8 +652,10 @@ package alternativa.engine3d.resources {
 				_indexBuffer = null;
 				for (i = 0; i < numBuffers; i++) {
 					vBuffer = _vertexStreams[i];
-					vBuffer.buffer.dispose();
-					vBuffer.buffer = null;
+					if (vBuffer.buffer != null) {
+						vBuffer.buffer.dispose();
+						vBuffer.buffer = null;
+					}
 				}
 			}
 			if (_indices.length <= 0 || _numVertices <= 0) {