diff --git a/class-jobs.php b/class-jobs.php
index b9f6c1b..c12cb70 100755
--- a/class-jobs.php
+++ b/class-jobs.php
@@ -707,7 +707,7 @@ public function save_job( $job_id, WP_Post $job ) {
 
 			$terms_data = stripslashes_deep( $_POST['bbl_translation']['terms'] );
 			if ( true === is_array( $terms_data ) ) {
-				array_walk_recursive( $terms_data, 'sanitize_text_field_by_reference' );
+				array_walk_recursive( $terms_data, array( $this, 'sanitize_text_field_by_reference' ) );
 			} else {
 				$terms_data = sanitize_text_field( $terms_data );
 			}