diff --git a/be/src/agent/task_worker_pool.cpp b/be/src/agent/task_worker_pool.cpp
index b9922c127185ef..55975ddd1fb32c 100644
--- a/be/src/agent/task_worker_pool.cpp
+++ b/be/src/agent/task_worker_pool.cpp
@@ -296,7 +296,7 @@ void alter_cloud_tablet(CloudStorageEngine& engine, const TAgentTaskRequest& age
                 job.process_alter_tablet(agent_task_req.alter_tablet_req_v2),
                 [&](const doris::Exception& ex) {
                     DorisMetrics::instance()->create_rollup_requests_failed->increment(1);
-                    job.clean_up_on_failed();
+                    job.clean_up_on_failure();
                 });
         return Status::OK();
     }();
diff --git a/be/src/cloud/cloud_schema_change_job.cpp b/be/src/cloud/cloud_schema_change_job.cpp
index 405dcbe1a0d3cc..9e8d3f85a0809e 100644
--- a/be/src/cloud/cloud_schema_change_job.cpp
+++ b/be/src/cloud/cloud_schema_change_job.cpp
@@ -532,7 +532,10 @@ Status CloudSchemaChangeJob::_process_delete_bitmap(int64_t alter_version,
     return Status::OK();
 }
 
-void CloudSchemaChangeJob::clean_up_on_failed() {
+void CloudSchemaChangeJob::clean_up_on_failure() {
+    if (_new_tablet == nullptr) {
+        return;
+    }
     if (_new_tablet->keys_type() == KeysType::UNIQUE_KEYS &&
         _new_tablet->enable_unique_key_merge_on_write()) {
         _cloud_storage_engine.meta_mgr().remove_delete_bitmap_update_lock(
diff --git a/be/src/cloud/cloud_schema_change_job.h b/be/src/cloud/cloud_schema_change_job.h
index 2a33443137ebb0..2f49f3eab6dac7 100644
--- a/be/src/cloud/cloud_schema_change_job.h
+++ b/be/src/cloud/cloud_schema_change_job.h
@@ -36,7 +36,7 @@ class CloudSchemaChangeJob {
     // This method is idempotent for a same request.
     Status process_alter_tablet(const TAlterTabletReqV2& request);
 
-    void clean_up_on_failed();
+    void clean_up_on_failure();
 
 private:
     Status _convert_historical_rowsets(const SchemaChangeParams& sc_params,