diff --git a/telethon/_network/connection/connection.py b/telethon/_network/connection/connection.py
index 4570180d..abf398ee 100644
--- a/telethon/_network/connection/connection.py
+++ b/telethon/_network/connection/connection.py
@@ -263,15 +263,14 @@ class Connection(abc.ABC):
 
         if self._writer:
             self._writer.close()
-            if sys.version_info >= (3, 7):
-                try:
-                    await self._writer.wait_closed()
-                except Exception as e:
-                    # Disconnecting should never raise. Seen:
-                    # * OSError: No route to host and
-                    # * OSError: [Errno 32] Broken pipe
-                    # * ConnectionResetError
-                    self._log.info('%s during disconnect: %s', type(e), e)
+            try:
+                await self._writer.wait_closed()
+            except Exception as e:
+                # Disconnecting should never raise. Seen:
+                # * OSError: No route to host and
+                # * OSError: [Errno 32] Broken pipe
+                # * ConnectionResetError
+                self._log.info('%s during disconnect: %s', type(e), e)
 
     def send(self, data):
         """
diff --git a/telethon/errors/__init__.py b/telethon/errors/__init__.py
index 152e7823..0d4ea0cc 100644
--- a/telethon/errors/__init__.py
+++ b/telethon/errors/__init__.py
@@ -1,5 +1,3 @@
-import sys
-
 from ._custom import (
     ReadCancelledError,
     TypeNotFoundError,
@@ -25,24 +23,6 @@ from ._rpcbase import (
     _mk_error_type
 )
 
-if sys.version_info < (3, 7):
-    # https://stackoverflow.com/a/7668273/
-    class _TelethonErrors:
-        def __init__(self, _mk_error_type, everything):
-            self._mk_error_type = _mk_error_type
-            self.__dict__.update({
-                k: v
-                for k, v in everything.items()
-                if isinstance(v, type) and issubclass(v, Exception)
-            })
-
-        def __getattr__(self, name):
-            return self._mk_error_type(name=name)
-
-    sys.modules[__name__] = _TelethonErrors(_mk_error_type, globals())
-else:
-    # https://www.python.org/dev/peps/pep-0562/
-    def __getattr__(name):
-        return _mk_error_type(name=name)
-
-del sys
+# https://www.python.org/dev/peps/pep-0562/
+def __getattr__(name):
+    return _mk_error_type(name=name)