diff --git a/addons/anonymization/anonymization.py b/addons/anonymization/anonymization.py
index 6b6db168a4f..43d198b27e2 100644
--- a/addons/anonymization/anonymization.py
+++ b/addons/anonymization/anonymization.py
@@ -68,8 +68,10 @@ class ir_model_fields_anonymization(osv.osv):
         return state
 
     def _check_write(self, cr, uid, context=None):
-        # check that the field is created from the menu and not from an database update
-        # otherwise the database update can crash:
+        """check that the field is created from the menu and not from an database update
+           otherwise the database update can crash:"""
+        if context is None:
+            context = {}
 
         if context.get('manual'):
             global_state = self._get_global_state(cr, uid, context=context)
@@ -295,10 +297,10 @@ class ir_model_fields_anonymize_wizard(osv.osv_memory):
 
     def fields_view_get(self, cr, uid, view_id=None, view_type='form', context=None, *args, **kwargs):
         state = self.pool.get('ir.model.fields.anonymization')._get_global_state(cr, uid, context=context)
-        
+
         if context is None:
             context = {}
-        
+
         step = context.get('step', 'new_window')
 
         res = super(ir_model_fields_anonymize_wizard, self).fields_view_get(cr, uid, view_id, view_type, context, *args, **kwargs)