diff --git a/src/main/java/org/ntlab/citrusserver/repositories/FavoriteManager.java b/src/main/java/org/ntlab/citrusserver/repositories/FavoriteManager.java
index b3b0e12..509ff42 100644
--- a/src/main/java/org/ntlab/citrusserver/repositories/FavoriteManager.java
+++ b/src/main/java/org/ntlab/citrusserver/repositories/FavoriteManager.java
@@ -23,19 +23,26 @@
                     HashSet<String>>> //otheraccounts
             favoritedMap = new HashMap<>();
 
-
+    //get
     //book_idをいいねしたaccount_idをリストとして返す
     public HashSet<String> getFavorited(String accountId, int bookId) {
         if(accountManager.getAccount(accountId) == null) return null; //アカウントが存在しない
 
         return favoritedMap.get(accountId).get(bookId);
     }
-
+    //put
     //other_account_idの人がaccount_idのbook_idにいいねをした時
     public void putFavorited(String accountId, int bookId, String otherAccountId) {
+        if(!favoritedMap.containsKey(accountId)) { //accountがなかったらbookidとotheraccountsの空のハッシュマップを用意
+            favoritedMap.put(accountId, new HashMap<>());
+        }
+        if(!favoritedMap.containsKey(bookId)) { //accountがなかったらbookidとotheraccountsの空のハッシュマップを用意
+            favoritedMap.get(accountId).put(bookId, new HashSet<>());
+        }
+
         favoritedMap.get(accountId).get(bookId).add(otherAccountId);
     }
-
+    //delete
     //イイねしたaccount_idをイイねした人リストから削除
     public void removeFavorited(String accountId, int bookId, String otherAccountId) {
         favoritedMap.get(accountId).get(bookId).remove(otherAccountId);