diff --git a/src/jquery.gridster.js b/src/jquery.gridster.js
index 8d2fab8a1..bf6d78973 100644
--- a/src/jquery.gridster.js
+++ b/src/jquery.gridster.js
@@ -2143,10 +2143,14 @@
         var actual_cols = this.$widgets.map(function() {
             return $(this).attr('data-col');
         });
+        //needed to pass tests with phantomjs
+        actual_cols.length || (actual_cols = [0]);
 
         var actual_rows = this.$widgets.map(function() {
             return $(this).attr('data-row');
         });
+        //needed to pass tests with phantomjs
+        actual_rows.length || (actual_rows = [0]);
 
         var min_cols = Math.max.apply(Math, actual_cols);
         var min_rows = Math.max.apply(Math, actual_rows);