diff --git a/pyrogram/raw/core/tl_object.py b/pyrogram/raw/core/tl_object.py
index 48b3ec91..de596a8b 100644
--- a/pyrogram/raw/core/tl_object.py
+++ b/pyrogram/raw/core/tl_object.py
@@ -30,7 +30,16 @@ class TLObject:
 
     @classmethod
     def read(cls, data: BytesIO, *args: Any) -> Any:
-        return cast(TLObject, objects[int.from_bytes(data.read(4), "little")]).read(data, *args)
+        try:
+            return cast(TLObject, objects[int.from_bytes(data.read(4), "little")]).read(data, *args)
+        except KeyError as e:
+            left = data.read()
+
+            left = [left[i:i + 64] for i in range(0, len(left), 64)]
+            left = [[left[i:i + 8] for i in range(0, len(left), 8)] for left in left]
+            left = "\n".join(" ".join(x for x in left) for left in left)
+
+            raise ValueError(f"Unknown constructor found: {hex(e.args[0])}\n{left}")
 
     def write(self, *args: Any) -> bytes:
         pass