From e4f99df07c2f26be0966eeefdf18ac53e03e5b49 Mon Sep 17 00:00:00 2001
From: Dan <14043624+delivrance@users.noreply.github.com>
Date: Mon, 26 Apr 2021 16:09:39 +0200
Subject: [PATCH] Better error message in case of empty data in buffer

---
 pyrogram/crypto/mtproto.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pyrogram/crypto/mtproto.py b/pyrogram/crypto/mtproto.py
index bbe9d27a..dad30cd3 100644
--- a/pyrogram/crypto/mtproto.py
+++ b/pyrogram/crypto/mtproto.py
@@ -63,6 +63,9 @@ def unpack(b: BytesIO, session_id: bytes, auth_key: bytes, auth_key_id: bytes) -
     try:
         message = Message.read(data)
     except KeyError as e:
+        if e.args[0] == 0:
+            raise ConnectionError(f"Received empty data. Check your internet connection.")
+
         left = data.read().hex()
 
         left = [left[i:i + 64] for i in range(0, len(left), 64)]