diff --git a/build/Calendar.js b/build/Calendar.js
index cf37926a..59ef09b5 100644
--- a/build/Calendar.js
+++ b/build/Calendar.js
@@ -138,8 +138,10 @@ var Calendar = function (_Component) {
 
       var onChange = _this.props.onChange;
 
-      var processedValue = _this.getProcessedValue(value);
-      if (onChange) onChange(processedValue);
+      if (onChange) {
+        var processedValue = _this.getProcessedValue(value);
+        onChange(processedValue);
+      }
     }, _temp), (0, _possibleConstructorReturn3.default)(_this, _ret);
   }
 
diff --git a/build/shared/propTypes.js b/build/shared/propTypes.js
index bb0a9fe8..785e6f9d 100644
--- a/build/shared/propTypes.js
+++ b/build/shared/propTypes.js
@@ -69,7 +69,7 @@ var isView = exports.isView = function isView(props, propName, componentName) {
 
   var allowedViews = views || allViews;
 
-  if (!allowedViews.includes(view)) {
+  if (allowedViews.indexOf(view) === -1) {
     return new Error('Warning: Failed prop type: Invalid prop `' + propName + '` of value `' + view + '` supplied to `' + componentName + '`, expected one of [' + ['a', 'b', 'c', 'd', 'e'].map(function (a) {
       return '"' + a + '"';
     }).join(', ') + '].');