From 4c17d88397d9cdf81e4573404837e5c1754dd024 Mon Sep 17 00:00:00 2001
From: Brian Delhaisse <briandelhaisse@gmail.com>
Date: Tue, 16 Jul 2019 00:00:31 +0200
Subject: [PATCH] fix small bug in world

---
 pyrobolearn/worlds/world.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pyrobolearn/worlds/world.py b/pyrobolearn/worlds/world.py
index 5b9c4f0..0ab556f 100644
--- a/pyrobolearn/worlds/world.py
+++ b/pyrobolearn/worlds/world.py
@@ -391,7 +391,8 @@ class World(object):
 
         # call the step method for each body
         for body in self.bodies.values():
-            body.step()
+            if isinstance(body, Body):
+                body.step()
 
         # call simulation step
         self.sim.step()