diff --git a/scrapy/utils/engine.py b/scrapy/utils/engine.py
index 6692f06fa..c7455d0c8 100644
--- a/scrapy/utils/engine.py
+++ b/scrapy/utils/engine.py
@@ -24,8 +24,8 @@ def get_engine_status(engine=None):
         "engine.spider_is_idle(spider)",
         "engine.slots[spider].closing",
         "len(engine.slots[spider].inprogress)",
-        "len(engine.slots[spider].scheduler.dq)",
-        "len(engine.slots[spider].scheduler.mq)",
+        "len(engine.slots[spider].scheduler.dqs or [])",
+        "len(engine.slots[spider].scheduler.mqs)",
         "len(engine.scraper.slots[spider].queue)",
         "len(engine.scraper.slots[spider].active)",
         "engine.scraper.slots[spider].active_size",