BUG: add check so maybe_upcast_putmask is only called with ndarray

Author: arw2019

pandas/core/frame.py

@@ -4847,7 +4847,7 @@ def _maybe_casted_values(index, labels=None):
                     if issubclass(values_type, DatetimeLikeArray):
                         values = values._data  # TODO: can we de-kludge yet?
 
-                    if mask.any():
+                    if mask.any() and isinstance(values, np.ndarray):
                         values, _ = maybe_upcast_putmask(values, mask, np.nan)
 
                     if issubclass(values_type, DatetimeLikeArray):