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>Database.php line 843 calls Database::freeResult()</li>
<li>Article.php line 391 calls Database::selectRow()</li>
<li>Article.php line 403 calls Article::pageData()</li>
<li>Wiki.php line 209 calls Article::pageDataFromTitle()</li>
<li>Wiki.php line 48 calls MediaWiki::initializeArticle()</li>
<li>index.php line 123 calls MediaWiki::initialize()</li>
</ul>
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