From 5e4a2badb251fefa286c9997c72c576458be8175 Mon Sep 17 00:00:00 2001
From: Michael Vogel <icarus@dabo.de>
Date: Thu, 28 Apr 2016 06:56:55 +0200
Subject: [PATCH] Check before doing the database update

---
 include/api.php | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/api.php b/include/api.php
index 996c52f54e..488e858445 100644
--- a/include/api.php
+++ b/include/api.php
@@ -1335,9 +1335,12 @@
 
 		$idlist = implode(",", $idarray);
 
-		if ($idlist != "")
-			$r = q("UPDATE `item` SET `unseen` = 0 WHERE `unseen` AND `id` IN (%s)", $idlist);
+		if ($idlist != "") {
+			$unseen = q("SELECT `id` FROM `item` WHERE `unseen` AND `id` IN (%s)", $idlist);
 
+			if ($unseen)
+				$r = q("UPDATE `item` SET `unseen` = 0 WHERE `unseen` AND `id` IN (%s)", $idlist);
+		}
 
 		$data = array('$statuses' => $ret);
 		switch($type){