PS 5.7.20>CREATE USER roel@''; Query OK, 0 rows affected (0.01 sec)
PS 5.7.20>GRANT PROXY ON roel TO''@''; ERROR 1133 (42000): Can't find any matching row in the user table << inconsistent also
PS 5.5.58>CREATE USER roel@''; Query OK, 0 rows affected (0.00 sec)
PS 5.5.58>GRANT PROXY ON roel TO''@''; Query OK, 0 rows affected (0.00 sec)
PS 5.7.20>CREATE USER roel@'';
Query OK, 0 rows affected (0.01 sec)
PS 5.7.20>GRANT PROXY ON roel TO''@'';
ERROR 1133 (42000): Can't find any matching row in the user table << inconsistent also
PS 5.5.58>CREATE USER roel@'';
Query OK, 0 rows affected (0.00 sec)
PS 5.5.58>GRANT PROXY ON roel TO''@'';
Query OK, 0 rows affected (0.00 sec)