diff --git a/orm/topic.py b/orm/topic.py
index a4b2826f..85925b4a 100644
--- a/orm/topic.py
+++ b/orm/topic.py
@@ -9,12 +9,11 @@ class TopicFollower(Base):
     __tablename__ = 'topic_followers'
 
     id = None  # type: ignore
-    follower = Column(ForeignKey('author.id'), primary_key=True)
-    topic = Column(ForeignKey('topic.id'), primary_key=True)
-    created_at = Column(Integer, nullable=False, default=lambda: int(time.time()))
+    follower = Column(Integer, ForeignKey('author.id'), primary_key=True)
+    topic = Column(Integer, ForeignKey('topic.id'), primary_key=True)
+    created_at = Column(Integer, nullable=False, default=int(time.time()))
     auto = Column(Boolean, nullable=False, default=False)
 
-
 class Topic(Base):
     __tablename__ = 'topic'
 
diff --git a/resolvers/stat.py b/resolvers/stat.py
index 5f7bab38..e83ce514 100644
--- a/resolvers/stat.py
+++ b/resolvers/stat.py
@@ -191,7 +191,7 @@ def author_follows_topics(author_id: int):
     subquery_topic_followers = (
         select(
             [
-                TopicFollower.topic,
+                TopicFollower.topic_id,
                 func.count(distinct(TopicFollower.follower)).label('followers_stat'),
             ]
         )