diff --git a/dask_ml/wrappers.py b/dask_ml/wrappers.py
index 02edc1d22..2b78062ac 100644
--- a/dask_ml/wrappers.py
+++ b/dask_ml/wrappers.py
@@ -556,7 +556,7 @@ def _postfit_estimator(self):
         return self.estimator_
 
     def _fit_for_estimator(self, estimator, X, y, **fit_kwargs):
-        check_scoring(estimator, self.scoring)
+        check_scoring(estimator, self.scoring, allow_none=True)
         if not dask.is_dask_collection(X) and not dask.is_dask_collection(y):
             result = estimator.partial_fit(X=X, y=y, **fit_kwargs)
         else: