diff --git a/src/main/javascript/helpers/handlebars.js b/src/main/javascript/helpers/handlebars.js
index d19b1356..a39d7b9d 100644
--- a/src/main/javascript/helpers/handlebars.js
+++ b/src/main/javascript/helpers/handlebars.js
@@ -43,7 +43,11 @@ Handlebars.registerHelper('renderTextParam', function(param) {
         idAtt = ' id=\'' + valueId + '\'';
     }
 
-    defaultValue = sanitizeHtml(defaultValue);
+    if (defaultValue) {
+      defaultValue = sanitizeHtml(defaultValue);
+    } else {
+      defaultValue = '';
+    }
 
     if(isArray) {
         result = '<textarea class=\'body-textarea' + (param.required ? ' required' : '') + '\' name=\'' + name + '\'' + idAtt + dataVendorExtensions;
@@ -89,4 +93,4 @@ Handlebars.registerHelper('escape', function (value) {
     var text = Handlebars.Utils.escapeExpression(value);
 
     return new Handlebars.SafeString(text);
-});
\ No newline at end of file
+});
diff --git a/src/main/javascript/view/ParameterView.js b/src/main/javascript/view/ParameterView.js
index 0ee2516e..8fa963eb 100644
--- a/src/main/javascript/view/ParameterView.js
+++ b/src/main/javascript/view/ParameterView.js
@@ -24,7 +24,6 @@ SwaggerUi.Views.ParameterView = Backbone.View.extend({
     var consumes = this.model.consumes || [];
     var sampleJSON, signatureView;
 
-
     if (typeof type === 'undefined') {
       if (schema.$ref) {
         var ref = schema.$ref;