diff --git a/modules/backend/handlers/titles.go b/modules/backend/handlers/titles.go
index 45d4c9b..9f076d5 100644
--- a/modules/backend/handlers/titles.go
+++ b/modules/backend/handlers/titles.go
@@ -117,6 +117,9 @@ func (s Server) GetStudio(ctx context.Context, id int64) (*oapi.Studio, error) {
 	oapi_studio.Name = sqlc_studio.StudioName
 	oapi_studio.Description = sqlc_studio.StudioDesc
 
+	if sqlc_studio.IllustID == nil {
+		return &oapi_studio, nil
+	}
 	oapi_illust, err := s.GetImage(ctx, *sqlc_studio.IllustID)
 	if err != nil {
 		return &oapi_studio, fmt.Errorf("GetImage: %v", err)
@@ -152,12 +155,14 @@ func (s Server) mapTitle(ctx context.Context, title sqlc.Title) (oapi.Title, err
 		oapi_title.Tags = oapi_tag_names
 	}
 
-	oapi_image, err := s.GetImage(ctx, *title.PosterID)
-	if err != nil {
-		return oapi_title, fmt.Errorf("GetImage: %v", err)
-	}
-	if oapi_image != nil {
-		oapi_title.Poster = oapi_image
+	if title.PosterID != nil {
+		oapi_image, err := s.GetImage(ctx, *title.PosterID)
+		if err != nil {
+			return oapi_title, fmt.Errorf("GetImage: %v", err)
+		}
+		if oapi_image != nil {
+			oapi_title.Poster = oapi_image
+		}
 	}
 
 	oapi_studio, err := s.GetStudio(ctx, title.StudioID)
diff --git a/sql/migrations/000001_init.up.sql b/sql/migrations/000001_init.up.sql
index 81f2801..8bd40d1 100644
--- a/sql/migrations/000001_init.up.sql
+++ b/sql/migrations/000001_init.up.sql
@@ -60,6 +60,7 @@ CREATE TABLE studios (
 );
 
 CREATE TABLE titles (
+    // TODO: anime type (film, season etc)
     id                  bigint              GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
     -- example {"ru": ["Атака титанов", "Атака Титанов"],"en": ["Attack on Titan", "AoT"],"ja": ["進撃の巨人", "しんげきのきょじん"]}
     title_names         jsonb               NOT NULL,
@@ -88,6 +89,7 @@ CREATE TABLE usertitles (
     rate                int                 CHECK (rate > 0 AND rate <= 10),
     review_text         text,
     review_date         timestamptz
+    // TODO: series status
 );
 
 CREATE TABLE title_tags (