diff --git a/fastdeploy/engine/common_engine.py b/fastdeploy/engine/common_engine.py
index bc3dbd78d..c371eaff2 100644
--- a/fastdeploy/engine/common_engine.py
+++ b/fastdeploy/engine/common_engine.py
@@ -945,7 +945,7 @@ class EngineService:
 
         while self.running:
             try:
-                if self.engine_worker_queue.num_tasks() > 0:
+                if self.engine_worker_queue.exist_tasks():
                     time.sleep(0.001)
                     continue
                 if self.cfg.scheduler_config.splitwise_role != "mixed":