diff --git a/arigram/controllers.py b/arigram/controllers.py
index 89155cd..53ad976 100644
--- a/arigram/controllers.py
+++ b/arigram/controllers.py
@@ -985,7 +985,7 @@ class Controller:
 
         # TODO: handle cases when all chats muted on global level
         if chat["notification_settings"]["mute_for"] or self.model.is_me(
-            msg["sender"].get("user_id")
+            msg["sender_id"].get("user_id")
         ):
             return
 
diff --git a/arigram/msg.py b/arigram/msg.py
index 9fa2450..e4cdfda 100644
--- a/arigram/msg.py
+++ b/arigram/msg.py
@@ -220,7 +220,7 @@ class MsgProxy:
 
     @property
     def sender_id(self) -> int:
-        return self.msg["sender"].get("user_id") or self.msg["sender"].get(
+        return self.msg["sender_id"].get("user_id") or self.msg["sender_id"].get(
             "chat_id"
         )
 
diff --git a/arigram/views.py b/arigram/views.py
index 244f53a..87fd35b 100644
--- a/arigram/views.py
+++ b/arigram/views.py
@@ -280,7 +280,7 @@ class ChatView:
         msg = chat.get("last_message")
         if (
             msg
-            and self.model.is_me(msg["sender"].get("user_id"))
+            and self.model.is_me(msg["sender_id"].get("user_id"))
             and msg["id"] > chat["last_read_outbox_message_id"]
             and not self.model.is_me(chat["id"])
         ):
@@ -288,7 +288,7 @@ class ChatView:
             flags.append("unseen")
         elif (
             msg
-            and self.model.is_me(msg["sender"].get("user_id"))
+            and self.model.is_me(msg["sender_id"].get("user_id"))
             and msg["id"] <= chat["last_read_outbox_message_id"]
         ):
             flags.append("seen")
@@ -628,7 +628,7 @@ def get_last_msg(
     if not last_msg:
         return None, "<No messages yet>"
     return (
-        last_msg["sender"].get("user_id"),
+        last_msg["sender_id"].get("user_id"),
         parse_content(MsgProxy(last_msg), users),
     )