diff --git a/src/BulletCollision/CollisionDispatch/btCollisionWorld.cpp b/src/BulletCollision/CollisionDispatch/btCollisionWorld.cpp
index 7cc6b8ab0e..f74dcabc54 100644
--- a/src/BulletCollision/CollisionDispatch/btCollisionWorld.cpp
+++ b/src/BulletCollision/CollisionDispatch/btCollisionWorld.cpp
@@ -1037,7 +1037,7 @@ struct btSingleSweepCallback : public btBroadphaseRayCallback
 		  m_castShape(castShape)
 	{
 		btVector3 unnormalizedRayDir = (m_convexToTrans.getOrigin() - m_convexFromTrans.getOrigin());
-		btVector3 rayDir = unnormalizedRayDir.normalized();
+		btVector3 rayDir = unnormalizedRayDir.fuzzyZero() ? btVector3(btScalar(0.0), btScalar(0.0), btScalar(0.0)) : unnormalizedRayDir.normalized();
 		///what about division by zero? --> just set rayDirection[i] to INF/BT_LARGE_FLOAT
 		m_rayDirectionInverse[0] = rayDir[0] == btScalar(0.0) ? btScalar(BT_LARGE_FLOAT) : btScalar(1.0) / rayDir[0];
 		m_rayDirectionInverse[1] = rayDir[1] == btScalar(0.0) ? btScalar(BT_LARGE_FLOAT) : btScalar(1.0) / rayDir[1];