diff --git a/app/src/main/java/org/ntlab/acanthus_client/Acanthus.java b/app/src/main/java/org/ntlab/acanthus_client/Acanthus.java
index b8f859b..8adedf9 100644
--- a/app/src/main/java/org/ntlab/acanthus_client/Acanthus.java
+++ b/app/src/main/java/org/ntlab/acanthus_client/Acanthus.java
@@ -22,7 +22,7 @@
     //-----------------------------------------------------------------
     private Integer aid;
     private Animation currentAnimation;
-    private Collection<AnimationJson> animationJsonList;
+    private Collection<AnimationJson> animationJsonList = new ArrayList<>();
 
     //-----------------------------------------------------------------
     // getter