diff --git a/xls2ddl/xlsxData.py b/xls2ddl/xlsxData.py
index 49bc513..89915c0 100755
--- a/xls2ddl/xlsxData.py
+++ b/xls2ddl/xlsxData.py
@@ -203,11 +203,14 @@ class CRUDData(XLSXData):
 		if 'codes' not in self.data.keys():
 			return
 		for f in self.data['codes']:
-			r = self.check_field(f['field'])
+			fname = f.get('field')
+			if fname is None:
+				break
+			r = self.check_field(fname)
 			if not r:
 				raise CRUDException(
 					self.xlsxfile, 
-					f'code definintion error({f["field"]})')
+					f'code definintion error({fname})')
 
 
 	def check_field(self, fieldname):