diff --git a/litgpt/utils.py b/litgpt/utils.py
index 69a12b21f3..3ee720a1aa 100644
--- a/litgpt/utils.py
+++ b/litgpt/utils.py
@@ -405,16 +405,17 @@ def CLI(*args: Any, **kwargs: Any) -> Any:
     return CLI(*args, **kwargs)
 
 
-def capture_hparams():
+def capture_hparams() -> Dict[str, Any]:
     """Captures the local variables ('hyperparameters') from where this function gets called."""
     caller_frame = inspect.currentframe().f_back
     locals_of_caller = caller_frame.f_locals
     hparams = {}
     for name, value in locals_of_caller.items():
-        if isinstance(value, (int, float, str, bool, Path)):
+        if value is None or isinstance(value, (int, float, str, bool, Path)):
             hparams[name] = value
         if is_dataclass(value):
             hparams[name] = asdict(value)
+    return hparams
 
 
 def save_hyperparameters(function: callable, checkpoint_dir: Path) -> None: