diff --git a/lib/copy_this/www/lib/book.php b/lib/copy_this/www/lib/book.php
index 15a4acf63..27ec5d565 100644
--- a/lib/copy_this/www/lib/book.php
+++ b/lib/copy_this/www/lib/book.php
@@ -524,7 +524,7 @@ class Book
 				)
 			);
 		} else {
-			$bookId = $check['id'];
+			$bookId = $check['ID'];
 			$this->pdo->queryExec(
 				sprintf('
 							UPDATE bookinfo