Add the type property to that Image property in the Organization schema

add_filter( 'aioseo_schema_output', 'add_author_name_when_missing' );

function add_author_name_when_missing( $schema ) {	

		foreach ( $schema as &$schemaItem ) {

			if ( isset($schemaItem['@type']) && 'Organization' === $schemaItem['@type'] ) {

				if(!isset($schemaItem['image']['@type'])){

					$schemaItem['image']['@type'] = 'ImageObject';

				}

			}

		}

	return $schema;

}