diff --git a/includes/core/um-actions-login.php b/includes/core/um-actions-login.php
index 5c773012..f0dd2bd3 100644
--- a/includes/core/um-actions-login.php
+++ b/includes/core/um-actions-login.php
@@ -68,9 +68,9 @@ function um_submit_form_errors_hook_login( $args ) {
 		UM()->form()->add_error( $user->get_error_code(), __( $user->get_error_message(), 'ultimate-member' ) );
 	}
 
-	$authenticate_user = apply_filters( 'wp_authenticate_user', $user_name, $args['user_password'] );
-	if ( is_wp_error( $authenticate_user ) && ! in_array( $authenticate_user->get_error_code(), $ignore_codes ) ) {
-		UM()->form()->add_error( $authenticate_user->get_error_code(), __( $authenticate_user->get_error_message(), 'ultimate-member' ) );
+	$user = apply_filters( 'wp_authenticate_user', $user, $args['user_password'] );
+	if ( is_wp_error( $user ) && ! in_array( $user->get_error_code(), $ignore_codes ) ) {
+		UM()->form()->add_error( $user->get_error_code(), __( $user->get_error_message(), 'ultimate-member' ) );
 	}
 
 	// if there is an error notify wp
diff --git a/readme.txt b/readme.txt
index 2feb6a2f..4843b130 100644
--- a/readme.txt
+++ b/readme.txt
@@ -150,6 +150,7 @@ The plugin works with popular caching plugins by automatically excluding Ultimat
   - Fixed "get_profile_photo_size" function (avoid PHP notice with array_combine )
   - Fixed password reset/change form when other forms are initialized at the same page
   - Fixed getting extension updates on multisites
+  - Fixed the 'wp_authenticate_user' filter's variables (changed username string to WP_User object)
   - Deprecated JS event 'um_before_modal_removed', use wp.hooks action 'um_before_modal_removed' instead
 
 = 2.1.6: June 1, 2020 =