diff --git a/cope2n-api/fwd_api/api/accuracy_view.py b/cope2n-api/fwd_api/api/accuracy_view.py
index 6809aaf..149c9f2 100755
--- a/cope2n-api/fwd_api/api/accuracy_view.py
+++ b/cope2n-api/fwd_api/api/accuracy_view.py
@@ -984,6 +984,8 @@ class AccuracyViewSet(viewsets.ViewSet):
                     }
                     for k, v in file_result.items():
                         if k in sample_result.keys():
+                            if isinstance(v, str) and v == '':
+                                v = None
                             if k == "purchase_date" and v is not None:
                                 v = v.split("")
                             if not isinstance(sample_result[k], list):