diff --git a/auquotidien/modules/payments.py b/auquotidien/modules/payments.py
index 22ec7c3..7e0aa04 100644
--- a/auquotidien/modules/payments.py
+++ b/auquotidien/modules/payments.py
@@ -567,8 +567,9 @@ class PublicPaymentDirectory(Directory):
     back = PublicPaymentRegieBackDirectory(False)
     back_asynchronous = PublicPaymentRegieBackDirectory(True)
 
-
     def init(self):
+        if 'invoice_ids' not in get_request().form:
+            raise errors.QueryError()
         invoice_ids = get_request().form.get('invoice_ids').split(' ')
 
         for invoice_id in invoice_ids: