diff --git a/cybertools/composer/schema/grid/field.py b/cybertools/composer/schema/grid/field.py
index 1310e7e..f6c4a17 100644
--- a/cybertools/composer/schema/grid/field.py
+++ b/cybertools/composer/schema/grid/field.py
@@ -167,7 +167,7 @@ class RecordsFieldInstance(GridFieldInstance):
     def marshall(self, value):
         result = []
         value = value or []
-        cardinality = getattr(self.context, 'cardinality', None)
+        cardinality = getattr(self.context, 'cardinality', None) or 0
         for row in value:
             item = {}
             for fi in self.columnFieldInstances:
diff --git a/cybertools/util/html.py b/cybertools/util/html.py
index 4e18bee..3e84a4c 100644
--- a/cybertools/util/html.py
+++ b/cybertools/util/html.py
@@ -24,6 +24,8 @@ sentencePattern = re.compile(r'[:.\?\!]')
 
 def sanitize(value, validTags=validTags, validAttrs=validAttrs,
                     validStyles=validStyles, stripEscapedComments=True):
+    if value is None:
+        return ''
     soup = BeautifulSoup(value, features='lxml')
     for comment in soup.findAll(string=lambda text: isinstance(text, Comment)):
         comment.extract()