diff --git a/src/python/parse.py b/src/python/parse.py
index 64e7fd7..1b7bc25 100644
--- a/src/python/parse.py
+++ b/src/python/parse.py
@@ -105,7 +105,7 @@ def _get_cell_info(self, index, row, column):
             "type": nested_types[-1],
             "unique_key": nested_keys[-1].strip("*"),
             "key": self._clean_key(nested_keys[-1]),
-            "value": row[column],
+            "value": row[column] if not pd.isna(row[column]) else None,
             "unit": column[2] if "Unnamed" not in column[2] else None,
         }