diff --git a/api/batch.py b/api/batch.py
index 1595339..726f2d0 100644
--- a/api/batch.py
+++ b/api/batch.py
@@ -21,6 +21,9 @@ async def batch_handler(request: Request):
     query = batch_token.select().where(batch_token.c.token == token)
     result = await database.fetch_one(query)
 
+    if not result:
+        return HTMLResponse(content="Invalid token", status_code=400)
+
     if result['expire_at'] < int(time.time()):
         return HTMLResponse(content="Token expired", status_code=400)
     
diff --git a/various-tools/Asset preloading flutter app/server_checker/android/app/build.gradle.kts b/various-tools/Asset preloading flutter app/server_checker/android/app/build.gradle.kts
index df140f3..1ac056c 100644
--- a/various-tools/Asset preloading flutter app/server_checker/android/app/build.gradle.kts	
+++ b/various-tools/Asset preloading flutter app/server_checker/android/app/build.gradle.kts	
@@ -6,7 +6,7 @@ plugins {
 }
 
 android {
-    namespace = "com.example.server_checker"
+    namespace = "jp.co.taito.groovecoasterzero"
     compileSdk = flutter.compileSdkVersion
     ndkVersion = flutter.ndkVersion
 
@@ -14,6 +14,7 @@ android {
         sourceCompatibility = JavaVersion.VERSION_11
         targetCompatibility = JavaVersion.VERSION_11
     }
+	
 
     kotlinOptions {
         jvmTarget = JavaVersion.VERSION_11.toString()
@@ -21,13 +22,13 @@ android {
 
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
-        applicationId = "com.example.server_checker"
+        applicationId = "jp.co.taito.groovecoasterzero"
         // You can update the following values to match your application needs.
         // For more information, see: https://flutter.dev/to/review-gradle-config.
         minSdk = flutter.minSdkVersion
         targetSdk = flutter.targetSdkVersion
-        versionCode = flutter.versionCode
-        versionName = flutter.versionName
+        versionCode = 76
+        versionName = "1.0.18"
     }
 
     buildTypes {
diff --git a/various-tools/Asset preloading flutter app/server_checker/pre-built/app-release.apk.sha1 b/various-tools/Asset preloading flutter app/server_checker/pre-built/app-release.apk.sha1
deleted file mode 100644
index d898083..0000000
--- a/various-tools/Asset preloading flutter app/server_checker/pre-built/app-release.apk.sha1	
+++ /dev/null
@@ -1 +0,0 @@
-7a8131d9aa79e42356d6df84508d44f230a6df95
\ No newline at end of file
diff --git a/various-tools/Asset preloading flutter app/server_checker/pre-built/app-release.apk b/various-tools/Asset preloading flutter app/server_checker/pre-built/server_checker.ver.1.0.18.build.76_clone.apk
similarity index 99%
rename from various-tools/Asset preloading flutter app/server_checker/pre-built/app-release.apk
rename to various-tools/Asset preloading flutter app/server_checker/pre-built/server_checker.ver.1.0.18.build.76_clone.apk
index 0a693df..dfe3525 100644
Binary files a/various-tools/Asset preloading flutter app/server_checker/pre-built/app-release.apk and b/various-tools/Asset preloading flutter app/server_checker/pre-built/server_checker.ver.1.0.18.build.76_clone.apk differ