diff --git a/src/debugpy/_vendored/pydevd/_pydevd_bundle/pydevd_net_command_factory_json.py b/src/debugpy/_vendored/pydevd/_pydevd_bundle/pydevd_net_command_factory_json.py
index a73b189d3..222f0817f 100644
--- a/src/debugpy/_vendored/pydevd/_pydevd_bundle/pydevd_net_command_factory_json.py
+++ b/src/debugpy/_vendored/pydevd/_pydevd_bundle/pydevd_net_command_factory_json.py
@@ -280,7 +280,7 @@ def make_get_thread_stack_message(self, py_db, seq, thread_id, topmost_frame, fm
         total_frames = len(frames)
         stack_frames = frames
         if bool(levels):
-            start = start_frame
+            start = start_frame if bool(start_frame) else 0
             end = min(start + levels, total_frames)
             stack_frames = frames[start:end]