diff --git a/addons/stock/wizard/stock_invoice_onshipping.py b/addons/stock/wizard/stock_invoice_onshipping.py
index f94f184ad42..395758b121b 100644
--- a/addons/stock/wizard/stock_invoice_onshipping.py
+++ b/addons/stock/wizard/stock_invoice_onshipping.py
@@ -26,7 +26,10 @@ from tools.translate import _
 class stock_invoice_onshipping(osv.osv_memory):
 
     def _get_journal(self, cr, uid, context=None):
-        return self._get_journal_id(cr, uid, context=context)[0][0] or False
+        res = self._get_journal_id(cr, uid, context=context)
+        if res:
+            return res[0]
+        return False
     
     def _get_journal_id(self, cr, uid, context=None):
         if context is None: