htmlspecialchars() expects parameter 1 to be string

Error: TypeError: htmlspecialchars() expects parameter 1 to be string, int given in file /modules/modulebuilder/class/Form/FormRadio.php line 52

ModuleBuilder 3.6.0 Beta 1 NOT RELEASED (11/04/2021) 
<html><body>


XOOPS Version | XOOPS 2.5.11-Beta2
-- | --
PHP Version | 7.4.27
MySQL Version | 5.5.5-10.4.22-MariaDB


</body>
</html>