Ensure integer number of zig-zags
diff --git a/player/js/utils/shapes/ZigZagModifier.js b/player/js/utils/shapes/ZigZagModifier.js
index d3c1068..79c19c3 100644
--- a/player/js/utils/shapes/ZigZagModifier.js
+++ b/player/js/utils/shapes/ZigZagModifier.js
@@ -74,7 +74,7 @@
   var j;
   var jLen;
   var amplitude = this.amplitude.v;
-  var frequency = this.frequency.v;
+  var frequency = Math.max(1, Math.round(this.frequency.v));
 
   if (amplitude !== 0) {
     var shapeData;