diff --git a/wallabag_api/wallabag.py b/wallabag_api/wallabag.py
index 0bfec5b..62c35d5 100644
--- a/wallabag_api/wallabag.py
+++ b/wallabag_api/wallabag.py
@@ -124,9 +124,10 @@ class Wallabag(object):
         :param kwargs:
         :return: value of the parm
         """
-        value = int(kwargs[what]) if type_attr == 'int' else kwargs[what]
-        if what in kwargs and value in value_attr:
-            return value
+        if what in kwargs:
+            value = int(kwargs[what]) if type_attr == 'int' else kwargs[what]
+            if value in value_attr:
+                return value
 
     # ENTRIES
     async def get_entries(self, **kwargs):