RSS Feed/News Create usergroup error

[ENXF NET]

When i try to create a new usergroup i receive the next error.
Is this a bug or something else?

Just installed my forum from scratch....

InvalidArgumentException: Attempted to convert NULL to integer [user_group_id] in src/XF/Mvc/Entity/Entity.php at line 808

1. XF\Mvc\Entity\Entity->_castValueToType() in src/XF/Mvc/Entity/Entity.php at line 682
2. XF\Mvc\Entity\Entity->set() in src/XF/Mvc/Entity/Entity.php at line 612...

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