diff --git a/tgbotapi.webapps/src/jsMain/kotlin/dev/inmo/tgbotapi/webapps/WebAppInitData.kt b/tgbotapi.webapps/src/jsMain/kotlin/dev/inmo/tgbotapi/webapps/WebAppInitData.kt
index 960a4360e5..1fe1f572a4 100644
--- a/tgbotapi.webapps/src/jsMain/kotlin/dev/inmo/tgbotapi/webapps/WebAppInitData.kt
+++ b/tgbotapi.webapps/src/jsMain/kotlin/dev/inmo/tgbotapi/webapps/WebAppInitData.kt
@@ -10,7 +10,7 @@ external interface WebAppInitData {
     val user: WebAppUser?
     val receiver: WebAppUser?
 
-    val chat: WebAppChat
+    val chat: WebAppChat?
 
     @JsName("chat_type")
     val chatType: ChatType?