diff --git a/src/meta/src/controller/fragment.rs b/src/meta/src/controller/fragment.rs
index 6c24a6a44e5b4..16228a06d0a9a 100644
--- a/src/meta/src/controller/fragment.rs
+++ b/src/meta/src/controller/fragment.rs
@@ -47,8 +47,8 @@ use risingwave_pb::stream_plan::{
 use sea_orm::sea_query::Expr;
 use sea_orm::ActiveValue::Set;
 use sea_orm::{
-    ColumnTrait, EntityTrait, JoinType, ModelTrait, PaginatorTrait, QueryFilter, QuerySelect,
-    RelationTrait, TransactionTrait, Value,
+    ColumnTrait, DbErr, EntityTrait, JoinType, ModelTrait, PaginatorTrait, QueryFilter,
+    QuerySelect, RelationTrait, TransactionTrait, Value,
 };
 
 use crate::controller::catalog::{CatalogController, CatalogControllerInner};
@@ -1099,19 +1099,7 @@ impl CatalogController {
         let txn = inner.db.begin().await?;
         for assignments in split_assignment.values() {
             for (actor_id, splits) in assignments {
-                let actor_splits: Option<ConnectorSplits> = Actor::find_by_id(*actor_id as ActorId)
-                    .select_only()
-                    .column(actor::Column::Splits)
-                    .into_tuple()
-                    .one(&txn)
-                    .await?
-                    .ok_or_else(|| MetaError::catalog_id_not_found("actor_id", actor_id))?;
-
-                let mut actor_splits = actor_splits
-                    .map(|splits| splits.to_protobuf().splits)
-                    .unwrap_or_default();
-                actor_splits.extend(splits.iter().map(Into::into));
-
+                let actor_splits = splits.iter().map(Into::into).collect_vec();
                 Actor::update(actor::ActiveModel {
                     actor_id: Set(*actor_id as _),
                     splits: Set(Some(ConnectorSplits::from(&PbConnectorSplits {
@@ -1120,7 +1108,14 @@ impl CatalogController {
                     ..Default::default()
                 })
                 .exec(&txn)
-                .await?;
+                .await
+                .map_err(|err| {
+                    if err == DbErr::RecordNotUpdated {
+                        MetaError::catalog_id_not_found("actor_id", actor_id)
+                    } else {
+                        err.into()
+                    }
+                })?;
             }
         }
         txn.commit().await?;