diff --git a/demo/gpudemo/rigidbody/ConcaveScene.cpp b/demo/gpudemo/rigidbody/ConcaveScene.cpp
index e401020f4..4e49991b6 100644
--- a/demo/gpudemo/rigidbody/ConcaveScene.cpp
+++ b/demo/gpudemo/rigidbody/ConcaveScene.cpp
@@ -258,11 +258,15 @@ void ConcaveScene::setupScene(const ConstructionInfo& ci)
 		
 		btVector4 scaling(4,4,4,1);
 
-		createConcaveMesh(ci,"data/plane100.obj",shift1,scaling);
+	//	createConcaveMesh(ci,"data/plane100.obj",shift1,scaling);
 		//createConcaveMesh(ci,"data/plane100.obj",shift,scaling);
 
 		b3Vector3 shift2(0,0,0);//0,230,80);//150,-100,-120);
 		createConcaveMesh(ci,"data/teddy.obj",shift2,scaling);
+
+		b3Vector3 shift3(130,-150,-75);//0,230,80);//150,-100,-120);
+		createConcaveMesh(ci,"data/leoTest1.obj",shift3,scaling);
+				
 				
 	} else
 	{
diff --git a/opencl/gpu_narrowphase/host/b3ConvexHullContact.cpp b/opencl/gpu_narrowphase/host/b3ConvexHullContact.cpp
index c8e63b676..dc35640cc 100644
--- a/opencl/gpu_narrowphase/host/b3ConvexHullContact.cpp
+++ b/opencl/gpu_narrowphase/host/b3ConvexHullContact.cpp
@@ -1084,7 +1084,7 @@ void GpuSatCollision::computeConvexConvexContactsGPUSAT( const btOpenCLArray<btI
 				
 				{
 				
-
+					if (treeNodesGPU->size() && treeNodesGPU->size())
 					{
 						BT_PROFILE("m_bvhTraversalKernel");
 						numConcavePairs = numConcavePairsOut.at(0);