diff --git a/scripts/hist_importer.py b/scripts/hist_importer.py
index 84fada560..526a752e2 100755
--- a/scripts/hist_importer.py
+++ b/scripts/hist_importer.py
@@ -107,7 +107,7 @@ def clean(history):
     Args:
         history: List of records (datetime, url, title) from source database.
     """
-    nulls = [record for record in history if record[0] is None]
+    nulls = [record for record in history if None in record]
     for null_datetime in nulls:
         history.remove(null_datetime)
     history = [list(record) for record in history]