diff --git a/modules/backend/handlers/users.go b/modules/backend/handlers/users.go
index eecd82f..c0f0f55 100644
--- a/modules/backend/handlers/users.go
+++ b/modules/backend/handlers/users.go
@@ -386,6 +386,9 @@ func (s Server) AddUserTitle(ctx context.Context, request oapi.AddUserTitleReque
 			// fmt.Println(pgErr.Code)    // => 42601
 			if pgErr.Code == pgErrDuplicateKey { //duplicate key value
 				return oapi.AddUserTitle409Response{}, nil
+			} else {
+				log.Errorf("%v", err)
+				return oapi.AddUserTitle500Response{}, nil
 			}
 		} else {
 			log.Errorf("%v", err)
diff --git a/sql/migrations/000001_init.up.sql b/sql/migrations/000001_init.up.sql
index 415b9af..57aa238 100644
--- a/sql/migrations/000001_init.up.sql
+++ b/sql/migrations/000001_init.up.sql
@@ -86,7 +86,6 @@ CREATE TABLE usertitles (
     status              usertitle_status_t  NOT NULL,
     rate                int                 CHECK (rate > 0 AND rate <= 10),
     review_id           bigint              REFERENCES reviews (id) ON DELETE SET NULL,
-    ctime               timestamptz         NOT NULL DEFAULT now(),
     ftime               timestamptz         NOT NULL DEFAULT now()
     -- // TODO: series status
 );