Ticket #40873: class-wp-ajax-upgrader-skin.diff

class-wp-ajax-upgrader-skin.php

@@ -99 +99 @@
                         }
 
                         // Count existing errors to generate an unique error code.
-                        $errors_count = count( $errors->get_error_codes() );
+                        $errors_count = count( $this->errors->get_error_codes() );
                         $this->errors->add( 'unknown_upgrade_error_' . $errors_count + 1 , $string );
                 } elseif ( is_wp_error( $errors ) ) {
                         foreach ( $errors->get_error_codes() as $error_code ) {