Very ugly fix for Carbon_Field_Association together with WPML on the Widgets page in the administration.

functions.php

<?php

# Resolving WPML and Carbon_Field_Association incompatibilities
add_filter('get_terms', 'crb_fix_get_terms_wpml', 0);
function crb_fix_get_terms_wpml($terms) {
	global $wp_filter, $sitepress;

	if ( is_admin() && !empty($sitepress) && !empty( $wp_filter['get_terms'] ) ) {
		foreach ($wp_filter['get_terms'] as $priority => $callbacks) {
			foreach ($callbacks as $callback_key => $callback) {
				if ( !empty($callback['function'][0]) && $callback['function'][0] instanceof iclNavMenu ) {
					unset( $wp_filter['get_terms'][$priority][$callback_key] );
				}
			}
		}
	}

	return $terms;
}