Ticket #39578: 39578.diff

wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php

@@ -560 +560 @@
                  */
                 $prepared_comment = apply_filters( 'rest_pre_insert_comment', $prepared_comment, $request );
 
+                if ( is_wp_error( $prepared_comment ) ) {
+                        return $prepared_comment;
+        }
+
                 $comment_id = wp_insert_comment( wp_filter_comment( wp_slash( (array) $prepared_comment ) ) );
 
                 if ( ! $comment_id ) {