diff --git a/odoo/addons/base/tests/test_module.py b/odoo/addons/base/tests/test_module.py
index b37c72e9485..a0b7c3ce79c 100644
--- a/odoo/addons/base/tests/test_module.py
+++ b/odoo/addons/base/tests/test_module.py
@@ -60,7 +60,7 @@ class TestModuleManifest(BaseCase):
             'name': f'Temp {self.module_name}',
             'new_page_templates': {},
             'post_init_hook': '',
-            'post_load': None,
+            'post_load': '',
             'pre_init_hook': '',
             'sequence': 100,
             'summary': '',
diff --git a/odoo/modules/module.py b/odoo/modules/module.py
index eac5b07a483..f3b074fe6f7 100644
--- a/odoo/modules/module.py
+++ b/odoo/modules/module.py
@@ -50,7 +50,7 @@ _DEFAULT_MANIFEST = {
     'new_page_templates': {},  # website themes
     #name, mandatory
     'post_init_hook': '',
-    'post_load': None,
+    'post_load': '',
     'pre_init_hook': '',
     'sequence': 100,
     'summary': '',