From 1f1714eae784ad10521d44e112cf809c9bac8ec4 Mon Sep 17 00:00:00 2001
From: samreid <reids@colorado.edu>
Date: Thu, 27 Jun 2019 13:28:28 -0600
Subject: [PATCH] Only step if dt > 0, see
 https://github.com/phetsims/gas-properties/issues/138

---
 js/Sim.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/js/Sim.js b/js/Sim.js
index 1854ad65..fdc01542 100644
--- a/js/Sim.js
+++ b/js/Sim.js
@@ -911,7 +911,7 @@ define( function( require ) {
       var dt = elapsedTimeMilliseconds / 1000.0;
 
       // Don't run the simulation on steps back in time (see https://github.com/phetsims/joist/issues/409)
-      if ( dt >= 0 ) {
+      if ( dt > 0 ) {
         this.stepSimulation( dt );
       }
     },