diff --git a/source/Ox/js/Collection.js b/source/Ox/js/Collection.js
index 18268635..72829f5d 100644
--- a/source/Ox/js/Collection.js
+++ b/source/Ox/js/Collection.js
@@ -470,7 +470,7 @@ if (
     || !(function() {
         try {
             return Ox.slice(document.getElementsByTagName('a'));
-        } catch () {}
+        } catch (error) {}
     }())
 ) {
     // FIXME: remove toArray alias
@@ -482,7 +482,7 @@ if (
         }
         try {
             ret = Array.prototype.slice.apply(collection, args);
-        } catch () {
+        } catch (error) {
             length = collection.length;
             for (index = 0; index < length; index++) {
                 array[index] = collection[index];