diff --git a/addons/l10n_fr_fec/wizard/fec.py b/addons/l10n_fr_fec/wizard/fec.py
index 45c0470a553..5500d4dd05b 100644
--- a/addons/l10n_fr_fec/wizard/fec.py
+++ b/addons/l10n_fr_fec/wizard/fec.py
@@ -197,7 +197,7 @@ class AccountFrFec(models.TransientModel):
             if unaffected_earnings_account:
                 unaffected_earnings_results[4] = unaffected_earnings_account.code
                 unaffected_earnings_results[5] = unaffected_earnings_account.name
-            w.writerow([s.encode("utf-8") for s in unaffected_earnings_results])
+            w.writerow([(s if s else '0,00').encode("utf-8") for s in unaffected_earnings_results])
 
         # LINES
         sql_query = '''