diff --git a/line-sdk/src/main/java/com/linecorp/linesdk/openchat/ui/CreateOpenChatActivity.kt b/line-sdk/src/main/java/com/linecorp/linesdk/openchat/ui/CreateOpenChatActivity.kt
index 45a8527..19bfee9 100644
--- a/line-sdk/src/main/java/com/linecorp/linesdk/openchat/ui/CreateOpenChatActivity.kt
+++ b/line-sdk/src/main/java/com/linecorp/linesdk/openchat/ui/CreateOpenChatActivity.kt
@@ -23,12 +23,13 @@ import com.linecorp.linesdk.databinding.ActivityCreateOpenChatBinding
 import com.linecorp.linesdk.openchat.OpenChatRoomInfo
 
 class CreateOpenChatActivity : AppCompatActivity() {
-    private enum class CreateOpenChatStep { ChatroomInfo, UserProfile }
+  private val channelId: String by lazy { intent.getStringExtra(ARG_CHANNEL_ID).orEmpty() }
+
+  private enum class CreateOpenChatStep { ChatroomInfo, UserProfile }
 
     private lateinit var binding: ActivityCreateOpenChatBinding
 
     private val lineApiClient: LineApiClient by lazy {
-        val channelId = intent.getStringExtra(ARG_CHANNEL_ID).orEmpty()
         LineApiClientBuilder(this, channelId)
             .build()
     }
@@ -38,6 +39,20 @@ class CreateOpenChatActivity : AppCompatActivity() {
     private var currentStep = CreateOpenChatStep.ChatroomInfo
 
     override fun onCreate(savedInstanceState: Bundle?) {
+      if (channelId.isBlank()) {
+        super.onCreate(null)
+
+        setResult(
+          RESULT_CANCELED,
+          Intent().putExtra(
+            ARG_ERROR_RESULT,
+            LineApiError("Missing channelId. Start CreateOpenChatActivity via createIntent(context, channelId).")
+          )
+        )
+        finish()
+        return
+      }
+
         super.onCreate(savedInstanceState)
         binding = ActivityCreateOpenChatBinding.inflate(layoutInflater)
         setContentView(binding.root)