Upgrading S9y to 1.6, I suddenly found serendipity_event_statistics.php 2743 ~line 410
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if (!preg_match()) $link_url = ' (<a href="' . htmlspecialchars($com_stat['url']) . '">' . PLUGIN_EVENT_STATISTICS_OUT_LINK . '</a>)';
throwing a preg_match() warning error, which I silenced with a @ .... but what does this statement wanted to say, as I believe it is a leftover or not fully coded?