diff --git a/js/cloud_geocoder.js b/js/cloud_geocoder.js
index 71e26a37..bf6b2968 100644
--- a/js/cloud_geocoder.js
+++ b/js/cloud_geocoder.js
@@ -26,7 +26,7 @@
           if (step) {
             step = Number.parseFloat(step);
           }
-          else {
+          if (!step || Number.isNaN(step)) {
             step = 0.000001;
           }
           step = 1 / step;