Index: percona-xtrabackup-7686bfc6e5a5163f73e2adea38eac0da06c9898e/sql/sql_acl.cc
===================================================================
--- percona-xtrabackup-7686bfc6e5a5163f73e2adea38eac0da06c9898e.orig/sql/sql_acl.cc
+++ percona-xtrabackup-7686bfc6e5a5163f73e2adea38eac0da06c9898e/sql/sql_acl.cc
@@ -3014,7 +3014,7 @@ static int replace_user_table(THD *thd,
       * An empty password is considered to be of mysql_native type.
     */
     
-    if (combo->plugin.str == NULL || combo->plugin.str == '\0')
+    if (combo->plugin.str == NULL || *(combo->plugin.str) == '\0')
     {
       if (combo->uses_identified_by_password_clause)
       {