diff --git a/edi_core_oca/models/edi_backend.py b/edi_core_oca/models/edi_backend.py
index 47d9c3db7..a8c6ce8bd 100644
--- a/edi_core_oca/models/edi_backend.py
+++ b/edi_core_oca/models/edi_backend.py
@@ -436,6 +436,7 @@ def exchange_process(self, exchange_record):
         old_state = state = exchange_record.edi_exchange_state
         error = traceback = False
         message = None
+        res = None
         try:
             res = self._exchange_process(exchange_record)
         except self._swallable_exceptions() as err: