From f205711aa27b132e97d416623552d26eeda2686d Mon Sep 17 00:00:00 2001
From: Hannes Vandevelde <hannes.vandevelde@calibrate.be>
Date: Thu, 21 Jun 2018 15:27:01 +0200
Subject: [PATCH 1/2] Added extra check in dayclick.

---
 src/DayPickerInput.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/DayPickerInput.js b/src/DayPickerInput.js
index 2bf963851e..0b5da787dc 100644
--- a/src/DayPickerInput.js
+++ b/src/DayPickerInput.js
@@ -454,7 +454,11 @@ export default class DayPickerInput extends React.Component {
     }
 
     // Do nothing if the day is disabled
-    if (modifiers.disabled) {
+    if (
+      modifiers.disabled ||
+      (dayPickerProps.classNames &&
+        modifiers[dayPickerProps.classNames.disabled])
+    ) {
       return;
     }
 

From 380acea6547cf2c19b44b6f10331437cb643a434 Mon Sep 17 00:00:00 2001
From: Hannes Vandevelde <hannes.vandevelde@calibrate.be>
Date: Thu, 21 Jun 2018 15:31:54 +0200
Subject: [PATCH 2/2] Extra check.

---
 src/DayPickerInput.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/DayPickerInput.js b/src/DayPickerInput.js
index 0b5da787dc..b4b7cd3137 100644
--- a/src/DayPickerInput.js
+++ b/src/DayPickerInput.js
@@ -456,7 +456,8 @@ export default class DayPickerInput extends React.Component {
     // Do nothing if the day is disabled
     if (
       modifiers.disabled ||
-      (dayPickerProps.classNames &&
+      (dayPickerProps &&
+        dayPickerProps.classNames &&
         modifiers[dayPickerProps.classNames.disabled])
     ) {
       return;