diff --git a/weboob/tools/application/formatters/table.py b/weboob/tools/application/formatters/table.py
index 6e6f1143..b1c6373b 100644
--- a/weboob/tools/application/formatters/table.py
+++ b/weboob/tools/application/formatters/table.py
@@ -37,6 +37,8 @@ class TableFormatter(IFormatter):
         self.queue.append(formatted.values())
 
     def flush(self):
+        if self.column_headers is None:
+            return None
         table = PrettyTable(self.column_headers)
         for column_header in self.column_headers:
             table.set_field_align(column_header, 'l')