diff --git a/docs/_basic/authenticating_oauth.md b/docs/_basic/authenticating_oauth.md
index 1688dd66b..ca2df33d5 100644
--- a/docs/_basic/authenticating_oauth.md
+++ b/docs/_basic/authenticating_oauth.md
@@ -29,10 +29,11 @@ const app = new App({
   installationStore: {
     storeInstallation: async (installation) => {
       // change the line below so it saves to your database
-      if (installation.isEnterpriseInstall) {
+      if (installation.isEnterpriseInstall && installation.enterprise !== undefined) {
         // support for org wide app installation
         return await database.set(installation.enterprise.id, installation);
-      } else {
+      }
+      if (installation.team !== undefined) {
         // single team app installation
         return await database.set(installation.team.id, installation);
       }
diff --git a/docs/_basic/ja_authenticating_oauth.md b/docs/_basic/ja_authenticating_oauth.md
index 48b0de91c..c83738bda 100644
--- a/docs/_basic/ja_authenticating_oauth.md
+++ b/docs/_basic/ja_authenticating_oauth.md
@@ -28,10 +28,11 @@ const app = new App({
   installationStore: {
     storeInstallation: async (installation) => {
       // 実際のデータベースに保存するために、ここのコードを変更
-      if (installation.isEnterpriseInstall) {
+      if (installation.isEnterpriseInstall && installation.enterprise !== undefined) {
         // OrG 全体へのインストールに対応する場合
         return await database.set(installation.enterprise.id, installation);
-      } else {
+      }
+      if (installation.team !== undefined) {
         // 単独のワークスペースへのインストールの場合
         return await database.set(installation.team.id, installation);
       }
diff --git a/docs/_tutorials/ja_migration_v3.md b/docs/_tutorials/ja_migration_v3.md
index 72c45a536..430c14299 100644
--- a/docs/_tutorials/ja_migration_v3.md
+++ b/docs/_tutorials/ja_migration_v3.md
@@ -50,10 +50,11 @@ installationStore: {
 ```javascript
 installationStore: {
     storeInstallation: async (installation) => {
-      if (installation.isEnterpriseInstall) {
+      if (installation.isEnterpriseInstall && installation.enterprise !== undefined) {
         // support for org wide app installation
         return await database.set(installation.enterprise.id, installation);
-      } else {
+      }
+      if (installation.team !== undefined) {
         // single team app installation
         return await database.set(installation.team.id, installation);
       }
diff --git a/docs/_tutorials/migration_v3.md b/docs/_tutorials/migration_v3.md
index 48d63b453..a700f6380 100644
--- a/docs/_tutorials/migration_v3.md
+++ b/docs/_tutorials/migration_v3.md
@@ -50,10 +50,11 @@ After:
 ```javascript
 installationStore: {
     storeInstallation: async (installation) => {
-      if (installation.isEnterpriseInstall) {
+      if (installation.isEnterpriseInstall && installation.enterprise !== undefined) {
         // support for org wide app installation
         return await database.set(installation.enterprise.id, installation);
-      } else {
+      }
+      if (installation.team !== undefined) {
         // single team app installation
         return await database.set(installation.team.id, installation);
       }