diff --git a/deps/oblib/src/lib/allocator/ob_page_manager.cpp b/deps/oblib/src/lib/allocator/ob_page_manager.cpp
index 1dc304b222..880c4747d6 100644
--- a/deps/oblib/src/lib/allocator/ob_page_manager.cpp
+++ b/deps/oblib/src/lib/allocator/ob_page_manager.cpp
@@ -125,8 +125,9 @@ int ObPageManagerCenter::print_tenant_stat(int64_t tenant_id,
     }
     return return_ret;
   };
-  rb_tree_.iter_rbtree(&rb_tree_, start, cb, &arg);
-
+  if (NULL != start) {
+    rb_tree_.iter_rbtree(&rb_tree_, start, cb, &arg);
+  }
   return ret;
 }