diff --git a/debug/accuracy_tools/ptdbg_ascend/src/python/ptdbg_ascend/debugger/debugger_config.py b/debug/accuracy_tools/ptdbg_ascend/src/python/ptdbg_ascend/debugger/debugger_config.py
index b08b7d661117a4341f6480d1d92cc5094f7a5d60..8d52978036c6276e983e9cd5dd2e7fcccc47afb1 100644
--- a/debug/accuracy_tools/ptdbg_ascend/src/python/ptdbg_ascend/debugger/debugger_config.py
+++ b/debug/accuracy_tools/ptdbg_ascend/src/python/ptdbg_ascend/debugger/debugger_config.py
@@ -7,7 +7,7 @@ class DebuggerConfig:
         self.dump_path = dump_path
         self.hook_name = hook_name
         self.rank = rank
-        self.step = step or []
+        self.step = step
         self.check()
         if self.step:
             self.step.sort()