diff --git a/src/EcoFOCIpy/io/nitrates_parser.py b/src/EcoFOCIpy/io/nitrates_parser.py
index 34f349e..0f5aaed 100644
--- a/src/EcoFOCIpy/io/nitrates_parser.py
+++ b/src/EcoFOCIpy/io/nitrates_parser.py
@@ -68,6 +68,6 @@ def FilterSuna(self,rmse_cutoff=0.00025):
         assert 'Fit RMSE' in self.data_frame.columns , 'Must provide a Fit RMSE column in data'
 
         self.data_frame = self.data_frame[self.data_frame['Fit RMSE'] <= rmse_cutoff]
-        self.data_frame = self.data_frame.resample('1H').median()
+        self.data_frame = self.data_frame.resample('1H').median(numeric_only=True)
 
         return self.data_frame