diff --git a/libs/core/langchain_core/utils/function_calling.py b/libs/core/langchain_core/utils/function_calling.py
index ead26d66aa8..932b329f870 100644
--- a/libs/core/langchain_core/utils/function_calling.py
+++ b/libs/core/langchain_core/utils/function_calling.py
@@ -203,9 +203,9 @@ def _get_python_function_required_args(function: Callable) -> List[str]:
 
     is_function_type = isinstance(function, FunctionType)
     is_method_type = isinstance(function, MethodType)
-    if is_function_type and required[0] == "self":
+    if required and is_function_type and required[0] == "self":
         required = required[1:]
-    elif is_method_type and required[0] == "cls":
+    elif required and is_method_type and required[0] == "cls":
         required = required[1:]
     return required
 
diff --git a/libs/core/tests/unit_tests/utils/test_function_calling.py b/libs/core/tests/unit_tests/utils/test_function_calling.py
index 1f818fe6bae..9973d972208 100644
--- a/libs/core/tests/unit_tests/utils/test_function_calling.py
+++ b/libs/core/tests/unit_tests/utils/test_function_calling.py
@@ -146,6 +146,16 @@ def test_function_optional_param() -> None:
     assert set(req) == {"b"}
 
 
+def test_function_no_params() -> None:
+    def nullary_function() -> None:
+        """nullary function"""
+        pass
+
+    func = convert_to_openai_function(nullary_function)
+    req = func["parameters"]["required"]
+    assert not req
+
+
 class FakeCall(BaseModel):
     data: str