diff --git a/langfuse/openai.py b/langfuse/openai.py
index 1a63835d4..324cdf52d 100644
--- a/langfuse/openai.py
+++ b/langfuse/openai.py
@@ -25,7 +25,7 @@
 from inspect import isclass
 from typing import Any, Optional, cast
 
-from openai._types import NotGiven
+from openai._types import NotGiven, Omit
 from packaging.version import Version
 from pydantic import BaseModel
 from wrapt import wrap_function_wrapper
@@ -398,6 +398,7 @@ def _get_langfuse_data_from_kwargs(resource: OpenAiDefinition, kwargs: Any) -> A
     if (
         metadata is not None
         and not isinstance(metadata, NotGiven)
+        and not isinstance(metadata, Omit)
         and not isinstance(metadata, dict)
     ):
         raise TypeError("metadata must be a dictionary")