diff --git a/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java b/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java
index 2a70436..b5b78ae 100644
--- a/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java
+++ b/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java
@@ -89,19 +89,25 @@
                     @Override
                     public void onResponse(Call<SigninResponse> call, Response<SigninResponse> response) {
                         if (response.isSuccessful()) {
-                            SigninResponse result = response.body();
+                            if(response.body() == null){
+                                //パスワードが違う際、アプリが落ちてしまうため
+                                Toast.makeText(SigninActivity.this,
+                                        "パスワードが違います",Toast.LENGTH_LONG).show();
+                            }else{
+                                SigninResponse result = response.body();
 
-                            //app/Cosmosに情報保存
-                            Cosmos app = (Cosmos)getApplication();
-                            app.setToken(result.token);
-                            app.setuId(UserIdText.getText().toString());
+                                //app/Cosmosに情報保存
+                                Cosmos app = (Cosmos) getApplication();
+                                app.setToken(result.token);
+                                app.setuId(UserIdText.getText().toString());
 
-                            //画面遷移
-                            Intent intent = new Intent(getApplication(), GroupListActivity.class);
-                            startActivity(intent);
-                            Toast.makeText(SigninActivity.this,
-                                    "ログインしました", Toast.LENGTH_SHORT).show();
-                            finish();
+                                //画面遷移
+                                Intent intent = new Intent(getApplication(), GroupListActivity.class);
+                                startActivity(intent);
+                                Toast.makeText(SigninActivity.this,
+                                        "ログインしました", Toast.LENGTH_SHORT).show();
+                                finish();
+                            }
 
                         }else{
                             //onFailureでキャッチできないエラーの処理
@@ -113,7 +119,7 @@
                     //失敗時
                     @Override
                     public void onFailure(Call<SigninResponse> call, Throwable t) {
-                        //t.printStackTrace();
+                        t.printStackTrace();
                         Toast.makeText(SigninActivity.this,
                                 "ユーザIDもしくはパスワードが間違っています",Toast.LENGTH_SHORT).show();
                     }