--- a/Helpviewer/OfflineStorage/WebDatabasesModel.py	Thu Mar 21 19:26:10 2019 +0100
+++ b/Helpviewer/OfflineStorage/WebDatabasesModel.py	Thu Mar 21 19:27:42 2019 +0100
@@ -124,6 +124,8 @@
                         db.displayName(), db.name())
                 elif index.column() == 1:
                     return self.__dataString(db.size())
+        
+        return None
     
     def columnCount(self, parent=None):
         """