diff --git a/lib/cartodb/controllers/named_maps.js b/lib/cartodb/controllers/named_maps.js
index b878890d..03008261 100644
--- a/lib/cartodb/controllers/named_maps.js
+++ b/lib/cartodb/controllers/named_maps.js
@@ -271,19 +271,18 @@ function getImageOptionsFromTemplate (template, zoom) {
     }
 }
 
-function getImageOptionsFromBoundingBox (bbox) {
-    if (bbox) {
-        var _bbox = bbox.split(',').map(numMapper);
-        if (_bbox.length === 4 && _bbox.every(Number.isFinite)) {
-            return {
-                bounds: {
-                    west: _bbox[0],
-                    south: _bbox[1],
-                    east: _bbox[2],
-                    north: _bbox[3]
-                }
-            };
-        }
+function getImageOptionsFromBoundingBox (bbox = '') {
+    var _bbox = bbox.split(',').map(numMapper);
+
+    if (_bbox.length === 4 && _bbox.every(Number.isFinite)) {
+        return {
+            bounds: {
+                west: _bbox[0],
+                south: _bbox[1],
+                east: _bbox[2],
+                north: _bbox[3]
+            }
+        };
     }
 }