diff --git a/js/common/model/MultipleParticleModel.js b/js/common/model/MultipleParticleModel.js
index 66f8bed8..aa35b611 100644
--- a/js/common/model/MultipleParticleModel.js
+++ b/js/common/model/MultipleParticleModel.js
@@ -789,7 +789,7 @@ define( function( require ) {
     stepInternal: function( dt ) {
 
       this.particleInjectedThisStep = false;
-      debugger;
+      // debugger;
       if ( window.printTheStuff ){
         console.log( JSON.stringify( this.moleculeDataSet, function( key, val ) {
           return typeof val === 'number' ? Number( val.toFixed( 3 ) ) : val;