diff --git a/moulinette/interfaces/cli.py b/moulinette/interfaces/cli.py
index 744afdc5..54216894 100644
--- a/moulinette/interfaces/cli.py
+++ b/moulinette/interfaces/cli.py
@@ -412,6 +412,9 @@ class ActionsMapParser(BaseActionsMapParser):
             else:
                 _p = _p._actions[1]
 
+        if tid == []:
+            return None
+
         raise MoulinetteError(f"Authentication undefined for {tid} ?", raw_msg=True)
 
     def parse_args(self, args, **kwargs):
@@ -497,6 +500,9 @@ class Interface:
         if output_as and output_as not in ["json", "plain", "none"]:
             raise MoulinetteValidationError("invalid_usage")
 
+        if not args:
+            raise MoulinetteValidationError("invalid_usage")
+
         try:
             ret = self.actionsmap.process(args, timeout=timeout)
         except (KeyboardInterrupt, EOFError):