Unable to free MySQL result

<p>Backtrace:</p>
<ul>
<li>GlobalFunctions.php line 602 calls wfBacktrace()</li>
<li>Database.php line 600 calls wfDebugDieBacktrace()</li>
<li>MessageCache.php line 266 calls Database::freeResult()</li>
<li>MessageCache.php line 174 calls MessageCache::loadFromDB()</li>
<li>MessageCache.php line 357 calls MessageCache::load()</li>
<li>GlobalFunctions.php line 449 calls MessageCache::get()</li>
<li>GlobalFunctions.php line 408 calls wfMsgGetKey()</li>
<li>GlobalFunctions.php line 361 calls wfMsgReal()</li>
<li>Wiki.php line 74 calls wfMsgForContent()</li>
<li>index.php line 106 calls MediaWiki::checkInitialQueries()</li>
</ul>
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