diff --git a/frappe/model/base_document.py b/frappe/model/base_document.py
index 3d5b002c75..1bde485ac4 100644
--- a/frappe/model/base_document.py
+++ b/frappe/model/base_document.py
@@ -233,8 +233,8 @@ class BaseDocument(object):
 				if isinstance(d[fieldname], list) and df.fieldtype not in table_fields:
 					frappe.throw(_('Value for {0} cannot be a list').format(_(df.label)))
 
-				if convert_dates_to_str and isinstance(d[fieldname], (datetime.datetime, datetime.time, datetime.timedelta)):
-					d[fieldname] = str(d[fieldname])
+			if convert_dates_to_str and isinstance(d[fieldname], (datetime.datetime, datetime.time, datetime.timedelta)):
+				d[fieldname] = str(d[fieldname])
 
 			if d[fieldname] == None and ignore_nulls:
 				del d[fieldname]