From 43260f181f40fa6e7b92e0a7b3f5c0d6f78bd66e Mon Sep 17 00:00:00 2001
From: Pekka Helenius <fincer89@hotmail.com>
Date: Wed, 23 Sep 2020 01:19:14 +0300
Subject: [PATCH] Add missing null check

Signed-off-by: Pekka Helenius <fincer89@hotmail.com>
---
 .../java/com/fjordtek/bookstore/web/BookController.java     | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/bookstore/src/main/java/com/fjordtek/bookstore/web/BookController.java b/bookstore/src/main/java/com/fjordtek/bookstore/web/BookController.java
index 93933ae..a6a359a 100644
--- a/bookstore/src/main/java/com/fjordtek/bookstore/web/BookController.java
+++ b/bookstore/src/main/java/com/fjordtek/bookstore/web/BookController.java
@@ -217,8 +217,10 @@ public class BookController {
 		Book bookI = bookRepository.findByIsbn(book.getIsbn());
 
 		// If existing ISBN value is not attached to the current book...
-		if (bookI.getId() != book.getId()) {
-			bindingResult.rejectValue("isbn", "error.user", "ISBN code already exists");
+		if (bookI != null) {
+			if (bookI.getId() != book.getId()) {
+				bindingResult.rejectValue("isbn", "error.user", "ISBN code already exists");
+			}
 		}
 
 		if (bindingResult.hasErrors()) {