Ticket #30501: rewrite-wp-loaded.patch

wp-includes/rewrite.php

@@ -2041 +2041 @@
          * @param bool $hard Whether to update .htaccess (hard flush) or just update rewrite_rules option (soft flush). Default is true (hard).
          */
         public function flush_rules($hard = true) {
+                // Prevent this action from running before everyone has registered their rewrites
+                if ( ! did_action( 'wp_loaded' ) ) {
+                        add_action( 'wp_loaded', array( $this, 'flush_rules' ) );
+                        return;
+                }
+
                 delete_option('rewrite_rules');
                 $this->wp_rewrite_rules();
                 /**