diff --git a/app/src/main/java/com/example/citrusclient/views/CreateBookFragment.java b/app/src/main/java/com/example/citrusclient/views/CreateBookFragment.java
index 2b72cfe..353d6b8 100644
--- a/app/src/main/java/com/example/citrusclient/views/CreateBookFragment.java
+++ b/app/src/main/java/com/example/citrusclient/views/CreateBookFragment.java
@@ -140,6 +140,9 @@
                         String accountId = ((Citrus) getActivity().getApplication()).getAccountId();
                         String token = ((Citrus) getActivity().getApplication()).getToken();
 
+                        if(color == null){
+                            color = "#D5D5D5"; //色が選択されてなかったらグレー
+                        }
                         booksViewModel.createBook(accountId, bookname, color, true, token);  //BooksViewModelを呼び出して本を作る
                         //画面が本棚に戻る