diff --git a/examples/CommonInterfaces/CommonTimeWarpBase.h b/examples/CommonInterfaces/CommonTimeWarpBase.h
index 3c01cba9e..dde06b417 100755
--- a/examples/CommonInterfaces/CommonTimeWarpBase.h
+++ b/examples/CommonInterfaces/CommonTimeWarpBase.h
@@ -843,6 +843,7 @@ struct CommonTimeWarpBase: public CommonRigidBodyBase {
 				debugDraw(m_dynamicsWorld->getDebugDrawer()->getDebugMode());
 			}
 		}
+		mIsHeadless = gIsHeadless;
 	}
 	void resetCamera() { // reset the camera to its original position
 		float dist = 41;
@@ -895,6 +896,7 @@ struct CommonTimeWarpBase: public CommonRigidBodyBase {
 	bool mPhysicsStepsPerSecondUpdated;
 	bool mFramesPerSecondUpdated;
 	bool mSolverIterationsUpdated;
+	bool mIsHeadless;
 };
 
 #endif //COMMON_TIME_WARP_BASE_H
diff --git a/examples/Evolution/NN3DWalkers.cpp b/examples/Evolution/NN3DWalkers.cpp
index 06cb14c28..52217b5c6 100755
--- a/examples/Evolution/NN3DWalkers.cpp
+++ b/examples/Evolution/NN3DWalkers.cpp
@@ -520,7 +520,7 @@ bool legContactProcessedCallback(btManifoldPoint& cp, void* body0, void* body1)
 	    // Make a circle with a 0.9 radius at (0,0,0)
 	    // with RGB color (1,0,0).
 		if(nn3DWalkers->m_dynamicsWorld->getDebugDrawer() != NULL){
-			if(!gIsHeadless){
+			if(!nn3DWalkers->mIsHeadless){
 				nn3DWalkers->m_dynamicsWorld->getDebugDrawer()->drawSphere(cp.getPositionWorldOnA(), 0.1, btVector3(1., 0., 0.));
 			}
 		}
@@ -1016,7 +1016,7 @@ void NN3DWalkersExample::scheduleEvaluations() {
 }
 
 void NN3DWalkersExample::drawMarkings() {
-	if(!gIsHeadless){
+	if(!mIsHeadless){
 		for(int i = 0; i < NUM_WALKERS;i++) // draw current distance plates of moving walkers
 		{
 			if(m_walkersInPopulation[i]->isInEvaluation()){