diff --git a/app/src/main/java/org/ntlab/developrx/DebugSubscriber.java b/app/src/main/java/org/ntlab/developrx/DebugSubscriber.java
index d20a5c2..8c9a9fa 100644
--- a/app/src/main/java/org/ntlab/developrx/DebugSubscriber.java
+++ b/app/src/main/java/org/ntlab/developrx/DebugSubscriber.java
@@ -6,7 +6,7 @@
 
 /**
  * デバッグ用のSubscriber
- *
+ * <p>
  * Created by matsumoto_k on 2017/11/12.
  */
 
@@ -18,6 +18,9 @@
         this.label = label;
     }
 
+    public DebugSubscriber() {
+    }
+
     @Override
     public void onNext(T data) {
         if (label == null) {