Frontend search with single quotation mark throws sql error

Search keyword:
Test'Artikel

[2014-08-14 12:34:03] Warning: "Database failure: 1064 (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 'artikel'' at line 1) - /cms/front_content.php?idart=20&idlang=1&search_term=Test%27Artikel SELECT keyword, auto FROM con_keywords WHERE idlang=1 AND keyword REGEXP 'test'artikel'
" at reportHalt() [class.db.driver.handler.php(977)]
reportHalt() called in file class.db.driver.handler.php(949)
halt() called in file class.db.driver.handler.php(677)
query() called in file class.search.php(351)
searchIndex() called in file class.module.search_result.php(212)
_performSearch() called in file class.module.search_result.php(146)
__construct() called in file include.front_content.php(660) : eval()'d code(622)
eval() called in file include.front_content.php(660)
include() called in file front_content.php(62)

[14-Aug-2014 10:34:03 UTC] PHP Warning: Database failure: 1064 (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 'artikel'' at line 1) - /cms/front_content.php?idart=20&idlang=1&search_term=Test%27Artikel SELECT keyword, auto FROM con_keywords WHERE idlang=1 AND keyword REGEXP 'test'artikel'
in contenido\includes\functions.general.php on line 1329
[2014-08-14 12:34:03] Warning: "Database failure: 1064 (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 'artikel'' at line 1) - /cms/front_content.php?idart=20&idlang=1&search_term=Test%27Artikel next_record called with no query pending in Module ID 30.
" at reportHalt() [class.db.driver.handler.php(977)]
reportHalt() called in file class.db.driver.handler.php(949)
halt() called in file class.db.driver.handler.php(693)
nextRecord() called in file class.search.php(353)
searchIndex() called in file class.module.search_result.php(212)
_performSearch() called in file class.module.search_result.php(146)
__construct() called in file include.front_content.php(660) : eval()'d code(622)
eval() called in file include.front_content.php(660)
include() called in file front_content.php(62)

[14-Aug-2014 10:34:03 UTC] PHP Warning: Database failure: 1064 (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 'artikel'' at line 1) - /cms/front_content.php?idart=20&idlang=1&search_term=Test%27Artikel next_record called with no query pending in Module ID 30.
in contenido\includes\functions.general.php on line 1329