diff --git a/halfapi/__init__.py b/halfapi/__init__.py
index 10aa592..9274551 100644
--- a/halfapi/__init__.py
+++ b/halfapi/__init__.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-__version__ = '0.5.1'
+__version__ = '0.5.2'
 
 def version():
     return f'HalfAPI version:{__version__}'
diff --git a/halfapi/lib/domain.py b/halfapi/lib/domain.py
index c310a9b..5ca13e0 100644
--- a/halfapi/lib/domain.py
+++ b/halfapi/lib/domain.py
@@ -6,7 +6,7 @@ lib/domain.py The domain-scoped utility functions
 import sys
 import importlib
 import logging
-from types import ModuleType
+from types import ModuleType, FunctionType
 from typing import Generator, Dict, List
 
 logger = logging.getLogger("uvicorn.asgi")
@@ -188,6 +188,9 @@ def router_acls(route_params: Dict, path: List, m_router: ModuleType) -> Generat
         else:
             for param in params:
                 acl = param.get('acl')
+                if not isinstance(acl, FunctionType):
+                    continue
+
                 yield acl.__name__, acl
 
 
diff --git a/halfapi/lib/routes.py b/halfapi/lib/routes.py
index 0a50c7e..7faa342 100644
--- a/halfapi/lib/routes.py
+++ b/halfapi/lib/routes.py
@@ -169,6 +169,9 @@ def api_acls(request):
     for domain, m_domain in domains.items():
         res[domain] = {}
         for acl_name, fct in domain_acls(m_domain, [domain]):
+            if not isinstance(fct, FunctionType):
+                continue
+
             fct_result = fct.__doc__.strip() if doc and fct.__doc__ else fct(request)
             if acl_name in res[domain]:
                 continue