Different Chars in TPL names bugging login components

[ghost]

Using different names and chars in value strings, seems to crash serveral parts of the login package, topmost the Register snippet. Rev 1.9.0 to 1.9.2

Working defaults in [[Register]] :
&activationEmailTpl=`lgnActivateEmailTpl`

After changing into:
&activationEmailTpl=`tpl_activate_account`
no Mail is sent and the Log output is:

(ERROR @ /xxx/xpdoobject.class.php : 240) Error 42000 executing statement: 
Array
(
    [0] => 42000
    [1] => 1064
    [2] => You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'AS`modAccess`WHERE`modAccess`.`principal`= 13' at line 1
)