diff --git a/src/werkzeug/debug/tbtools.py b/src/werkzeug/debug/tbtools.py
index a8e2c96e65..1388c16d3b 100644
--- a/src/werkzeug/debug/tbtools.py
+++ b/src/werkzeug/debug/tbtools.py
@@ -357,6 +357,10 @@ def __init__(
             tb = tb.tb_next  # type: ignore
 
     def filter_hidden_frames(self) -> None:
+        # If we don't have any frames to start with, there's nothing to filter
+        if not self.frames:
+            return
+
         new_frames: t.List[Frame] = []
         hidden = False