diff --git a/pyfair/model/model.py b/pyfair/model/model.py
index a029059..6493ac5 100644
--- a/pyfair/model/model.py
+++ b/pyfair/model/model.py
@@ -460,9 +460,9 @@ def calculate_all(self):
         # If required data has not been input, raise error
         ready_for_calculation = self._tree.ready_for_calculation()
         if not(ready_for_calculation):
-            status_str = str(pd.Series(self._tree.get_node_statuses()))
+            status_str = str(pd.Series(self._tree.get_node_statuses(), dtype='str'))
             raise FairException('Not ready for calculation. See statuses: \n{}'.format(status_str))
-        status = pd.Series(self._tree.get_node_statuses())
+        status = pd.Series(self._tree.get_node_statuses(), dtype='str')
         # Needs to be string to avoid weird numpy error with empty status array
         # https://stackoverflow.com/questions/40659212/futurewarning-elementwise-comparison-failed-returning-scalar-but-in-the-futur
         calculable_nodes = (status.loc[status.astype(str) == 'Calculable']
diff --git a/pyfair/report/base_report.py b/pyfair/report/base_report.py
index a5d556d..d89e746 100644
--- a/pyfair/report/base_report.py
+++ b/pyfair/report/base_report.py
@@ -204,7 +204,7 @@ def _get_metadata_table(self):
             'Created': str(datetime.datetime.now()).partition('.')[0],
             'PyFair Version': VERSION,
             'Type': type(self).__name__
-        }).to_frame().to_html(border=0, header=None, justify='left', classes='fair_metadata_table')
+        }).to_frame().to_html(border=0, header=False, justify='left', classes='fair_metadata_table')
         return metadata
 
     def _get_tree(self, model):