diff --git a/pyrogram/api/core/object.py b/pyrogram/api/core/object.py
index a1e20726..3cf12329 100644
--- a/pyrogram/api/core/object.py
+++ b/pyrogram/api/core/object.py
@@ -16,6 +16,7 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with Pyrogram.  If not, see <http://www.gnu.org/licenses/>.
 
+import logging
 from collections import OrderedDict
 from datetime import datetime
 from io import BytesIO
@@ -23,13 +24,23 @@ from json import JSONEncoder, dumps
 
 from ..all import objects
 
+log = logging.getLogger(__name__)
+
 
 class Object:
     all = {}
 
     @staticmethod
     def read(b: BytesIO, *args):
-        return Object.all[int.from_bytes(b.read(4), "little")].read(b, *args)
+        constructor_id = int.from_bytes(b.read(4), "little")
+
+        try:
+            return Object.all[constructor_id].read(b, *args)
+        except KeyError:
+            log.error("Unknown constructor found: {}. Full data: {}".format(
+                hex(constructor_id),
+                b.getvalue().hex())
+            )
 
     def write(self, *args) -> bytes:
         pass