src/cpl_cli/cli.py

@@ -89,8 +89,9 @@ class CLI(ApplicationABC):
 
                     if is_option:
                         args.append(cmd.name)
-                        for arg in result_args:
-                            args.append(arg)
+                        if result_args is not None:
+                            for arg in result_args:
+                                args.append(arg)
 
                     elif result is not None:
                         command = cmd.name

src/cpl_cli/command/help_service.py

@@ -39,11 +39,12 @@ class HelpService(CommandABC):
             command_name = args[0]
             command: Optional[CommandABC] = None
             for cmd in self._commands:
-                if cmd.name == command_name:
+                if cmd.name == command_name or command_name in cmd.aliases:
                     command = self._services.get_service(cmd.command)
 
             if command is None:
                 Console.error(f'Invalid argument: {command_name}')
+                return
 
             Console.write_line(command.help_message)