diff --git a/v6d3music/utils/assert_admin.py b/v6d3music/utils/assert_admin.py
index 963fb92..8307c98 100644
--- a/v6d3music/utils/assert_admin.py
+++ b/v6d3music/utils/assert_admin.py
@@ -6,7 +6,7 @@ __all__ = ('assert_admin',)
 
 
 def assert_admin(member: discord.Member | None):
-    assert member is not None
+    assert isinstance(member, discord.Member)
     permissions: discord.Permissions = member.guild_permissions
     if not permissions.administrator:
         raise Explicit('not an administrator')