diff --git a/packages/ragbits-core/src/ragbits/core/audit/base.py b/packages/ragbits-core/src/ragbits/core/audit/base.py
index d0e9f7fd..b8f1a745 100644
--- a/packages/ragbits-core/src/ragbits/core/audit/base.py
+++ b/packages/ragbits-core/src/ragbits/core/audit/base.py
@@ -18,7 +18,8 @@ def __init__(self) -> None:
         Constructs a new TraceHandler instance.
         """
         super().__init__()
-        self._spans = ContextVar[list[SpanT]]("_spans", default=[])
+        self._spans = ContextVar[list[SpanT]]("_spans")
+        self._spans.set([])
 
     @abstractmethod
     def start(self, name: str, inputs: dict, current_span: SpanT | None = None) -> SpanT: