MODX Parse Error たまにエラーが出てます

« MODX Parse Error »
MODX encountered the following error while attempting to parse the requested resource:
« Execution of a query to the database failed - Incorrect database name '' »
SHOW TABLE STATUS FROM ``modx01``
Basic info
REQUEST_URI : /manager/index.php?a=77
Manager action : 77 - Creating a new Chunk (HTML Snippet)
Referer : サイトURL/manager/index.php?a=76
User Agent : Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0
IP : 112.70.106.204
Benchmarks
MySQL : 0.0312 s (8 Requests)
PHP : 0.0469 s
Total : 0.0781 s
Memory : 3.5 MB

Backtrace
1 logHandler->initAndWriteLog()
manager/index.php on line 676
2 logHandler->writeToLog()
manager/includes/log.class.inc.php on line 42
3 $modx->rotate_log()
manager/includes/log.class.inc.php on line 89
4 SubParser->rotate_log()
manager/includes/document.parser.class.inc.php on line 3277
5 DBAPI->query()
manager/includes/extenders/sub.document.parser.class.inc.php on line 101

上記のエラーがたまに管理画面下に出てしまいます。サイト自体は正常に動いてるようですが、なにが問題なのでしょうか？
お助けください