diff --git a/telethon/_client/chats.py b/telethon/_client/chats.py
index cd6d9726..8ab4bff6 100644
--- a/telethon/_client/chats.py
+++ b/telethon/_client/chats.py
@@ -577,9 +577,6 @@ async def edit_permissions(
         ))
 
     user = await self.get_input_entity(user)
-    ty = helpers._entity_type(user)
-    if ty != helpers._EntityType.USER:
-        raise ValueError('You must pass a user entity')
 
     if isinstance(user, _tl.InputPeerSelf):
         raise ValueError('You cannot restrict yourself')
@@ -630,7 +627,7 @@ async def get_permissions(
         self: 'TelegramClient',
         entity: 'hints.EntityLike',
         user: 'hints.EntityLike' = None
-) -> 'typing.Optional[custom.ParticipantPermissions]':
+) -> 'typing.Optional[_custom.ParticipantPermissions]':
     entity = await self.get_entity(entity)
 
     if not user:
@@ -639,8 +636,7 @@ async def get_permissions(
 
     entity = await self.get_input_entity(entity)
     user = await self.get_input_entity(user)
-    if helpers._entity_type(user) != helpers._EntityType.USER:
-        raise ValueError('You must pass a user entity')
+
     if helpers._entity_type(entity) == helpers._EntityType.CHANNEL:
         participant = await self(_tl.fn.channels.GetParticipant(
             entity,
diff --git a/telethon/_events/inlinequery.py b/telethon/_events/inlinequery.py
index 76401962..59ad6baa 100644
--- a/telethon/_events/inlinequery.py
+++ b/telethon/_events/inlinequery.py
@@ -137,7 +137,7 @@ class InlineQuery(EventBuilder):
             Returns a new `InlineBuilder
             <telethon.tl.custom.inlinebuilder.InlineBuilder>` instance.
             """
-            return custom.InlineBuilder(self._client)
+            return _custom.InlineBuilder(self._client)
 
         async def answer(
                 self, results=None, cache_time=0, *,
diff --git a/telethon/types/_custom/button.py b/telethon/types/_custom/button.py
index 27f1aae9..0ea42d40 100644
--- a/telethon/types/_custom/button.py
+++ b/telethon/types/_custom/button.py
@@ -170,7 +170,7 @@ class Button:
         )
 
     @staticmethod
-    def mention(text, input_entity):
+    def mention(text, input_entity=None):
         """
         Creates a new inline button linked to the profile of user.