diff --git a/include/poller.php b/include/poller.php
index 90e94ede9e..755862eb6b 100644
--- a/include/poller.php
+++ b/include/poller.php
@@ -205,6 +205,12 @@ function poller_max_connections_reached() {
  */
 function poller_kill_stale_workers() {
 	$r = q("SELECT `pid`, `executed` FROM `workerqueue` WHERE `executed` != '0000-00-00 00:00:00'");
+
+	if (!is_array($r) || count($r) == 0) {
+		// No processing here needed
+		return;
+	}
+
 	foreach($r AS $pid)
 		if (!posix_kill($pid["pid"], 0))
 			q("UPDATE `workerqueue` SET `executed` = '0000-00-00 00:00:00', `pid` = 0 WHERE `pid` = %d",