From dcfa5a3ee235b3403875587943af2ef6636022c9 Mon Sep 17 00:00:00 2001
From: Benjamin Ellenberger <be.ellenberger@gmail.com>
Date: Tue, 2 Aug 2016 20:38:36 +0200
Subject: [PATCH] Clear gContactProcessedCallback on exiting physics.

---
 examples/Evolution/NN3DWalkers.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/examples/Evolution/NN3DWalkers.cpp b/examples/Evolution/NN3DWalkers.cpp
index af9a4162b..4ecdc9a2b 100755
--- a/examples/Evolution/NN3DWalkers.cpp
+++ b/examples/Evolution/NN3DWalkers.cpp
@@ -545,6 +545,8 @@ bool NN3DWalkers::keyboardCallback(int key, int state)
 void NN3DWalkers::exitPhysics()
 {
 
+	gContactProcessedCallback = NULL; // clear contact processed callback on exiting
+
 	int i;
 
 	for (i=0;i<m_walkers.size();i++)