guard against particle calls in empty bucket, #150

phetsims · Mar 31, 2017 · 87a337c · 87a337c
1 parent dbbd291
commit 87a337c
Showing 1 changed file with 9 additions and 6 deletions.
diff --git a/js/common/view/AtomView.js b/js/common/view/AtomView.js
@@ -192,14 +192,17 @@ define( function( require ) {
 
       bucketFront.addAccessibleInputListener( {
         click: function() {
-          // get the closest particle to nucleus
-          var nearestParticle = bucket.extractClosestParticle( new Vector2( 0, 0 ) );
+          if ( bucket.getParticleList().length > 0 ) {
 
-          // move it to the first drop location (offset by a little to indicate it is still being placed)
-          model.moveParticleToDropLocation( nearestParticle, model.particleAtom.positionProperty.get() );
+            // get the closest particle to nucleus
+            var nearestParticle = bucket.extractClosestParticle( new Vector2( 0, 0 ) );
 
-          // focus the atom for placement of particles
-          atomNode.electronShell.handleAccessibleDrag( nearestParticle, bucketFront );
+            // move it to the first drop location (offset by a little to indicate it is still being placed)
+            model.moveParticleToDropLocation( nearestParticle, model.particleAtom.positionProperty.get() );
+
+            // focus the atom for placement of particles
+            atomNode.electronShell.handleAccessibleDrag( nearestParticle, bucketFront );
+          }
         }
       } );
     } );