diff --git a/resolvers/author.py b/resolvers/author.py
index 22e44666..60705587 100644
--- a/resolvers/author.py
+++ b/resolvers/author.py
@@ -179,6 +179,12 @@ async def get_author(_, _info, slug="", author_id=None):
                     )
                     .count()
                 )
+                rating_sum = (
+                    session.query(func.sum(AuthorRating.value))
+                    .filter(AuthorRating.author == author.id)
+                    .scalar()
+                )
+                author.stat["rating"] = rating_sum
                 author.stat["commented"] = comments_count
         else:
             return {"error": "cant find author"}
@@ -213,7 +219,7 @@ async def get_author_followed(_, _info, slug="", user=None, author_id=None) -> L
         author_id_query = select(Author.id).where(Author.slug == slug)
     elif user:
         author_id_query = select(Author.id).where(Author.user == user)
-    if not author_id:
+    if author_id_query is not None and not author_id:
         with local_session() as session:
             author_id = session.execute(author_id_query).scalar()
 
diff --git a/resolvers/topic.py b/resolvers/topic.py
index 4336df52..5cde215f 100644
--- a/resolvers/topic.py
+++ b/resolvers/topic.py
@@ -197,5 +197,7 @@ def get_random_topic():
     q = q.order_by(func.random()).limit(1)
 
     with local_session() as session:
-        [topic] = session.execute(q).first()
-        return topic
+        r = session.execute(q).first()
+        if r:
+            [topic] = r
+            return topic