src/html/option.js in envjs-0.3.2 vs src/html/option.js in envjs-0.3.3

@@ -27,10 +27,10 @@
                 // select's value which modifies option's selected)
                 return;
             }
             HTMLInputCommon.prototype.setAttribute.call(this, 'selected', selectedValue);
             var parent = this.parentNode;
-            while (parent.tagName === "OPTGROUP") {
+            while (parent && parent.tagName === "OPTGROUP") {
                 parent = parent.parentNode;
             }
             if (value) {
                 // set select's value to this option's value (this also 
                 // unselects previously selected value)