diff --git a/composer/schema/grid/field.py b/composer/schema/grid/field.py
index 930039d..b1faeae 100644
--- a/composer/schema/grid/field.py
+++ b/composer/schema/grid/field.py
@@ -114,7 +114,7 @@ class RecordsFieldInstance(GridFieldInstance):
         for row in value or []:
             item = {}
             for fi in self.columnFieldInstances:
-                item[fi.name] = fi.marshall(row[fi.name])
+                item[fi.name] = fi.marshall(row.get(fi.name))
             result.append(item)
         return result