diff --git a/docs/source/whatsnew/skeleton.txt b/docs/source/whatsnew/skeleton.txt
index abb397d893..6c94dbdcc7 100644
--- a/docs/source/whatsnew/skeleton.txt
+++ b/docs/source/whatsnew/skeleton.txt
@@ -31,7 +31,10 @@ None
 Bug Fixes
 ~~~~~~~~~
 
-None
+- Fix ``DataPortal._first_trading_minute`` set to ``(None, None)`` tuple instead
+  of ``None`` when no first trading day is configured (:issue:`xxx`).
+- Fix ``DataPortal._get_daily_spot_value`` passing ``"minute"`` instead of
+  ``"daily"`` as data frequency to ``get_adjusted_value`` (:issue:`xxx`).
 
 Performance
 ~~~~~~~~~~~
diff --git a/src/zipline/data/data_portal.py b/src/zipline/data/data_portal.py
index bb317b1b78..ec11a54ed7 100644
--- a/src/zipline/data/data_portal.py
+++ b/src/zipline/data/data_portal.py
@@ -273,7 +273,7 @@ def __init__(
         self._first_trading_minute = (
             self.trading_calendar.session_first_minute(self._first_trading_day)
             if self._first_trading_day is not None
-            else (None, None)
+            else None
         )
 
         # Store the locs of the first day and first minute
@@ -734,7 +734,7 @@ def _get_daily_spot_value(self, asset, column, dt):
                         else:
                             # adjust if needed
                             return self.get_adjusted_value(
-                                asset, column, found_dt, dt, "minute", spot_value=value
+                                asset, column, found_dt, dt, "daily", spot_value=value
                             )
                     else:
                         found_dt -= self.trading_calendar.day