Issue pandas-dev#30520 check for NaT values

Author: ivan-vasilev

pandas/core/common.py

@@ -85,10 +85,12 @@ def maybe_box_datetimelike(value):
     # turn a datetime like into a Timestamp/timedelta as needed
 
     if isinstance(value, (np.datetime64, datetime)) \
-            and not isinstance(value, tslibs.Timestamp):
+            and not isinstance(value, tslibs.Timestamp) \
+            and notnull(value):
         value = tslibs.Timestamp(value)
     elif isinstance(value, (np.timedelta64, timedelta)) \
-            and not isinstance(value, tslibs.Timedelta):
+            and not isinstance(value, tslibs.Timedelta) \
+            and notnull(value):
         value = tslibs.Timedelta(value)
 
     return value