Please, change this comment to real exception https://github.com/mark-gerarts/automapper-plus/blob/d5ca462e99deae8c6628d15d5c67ab479ad1b8b9/src/MappingOperation/DefaultMappingOperation.php#L49 When this library is one block of big system, bugs like this is hard detection, if here will be real exception, life will be better, i think