diff --git a/boot.php b/boot.php
index 419a634fa2..ba692405a6 100644
--- a/boot.php
+++ b/boot.php
@@ -1086,6 +1086,11 @@ function proc_run($cmd) {
 	$parameters = json_encode($argv);
 	$found = dba::exists('workerqueue', array('parameter' => $parameters, 'done' => false));
 
+	// Quit if there was a database error - a precaution for the update process to 3.5.3
+	if (dba::errorNo() != 0) {
+		return;
+	}
+
 	if (!$found) {
 		dba::insert('workerqueue', array('parameter' => $parameters, 'created' => $created, 'priority' => $priority));
 	}
diff --git a/doc/htconfig.md b/doc/htconfig.md
index d3d4dad6ef..cbb76a38c3 100644
--- a/doc/htconfig.md
+++ b/doc/htconfig.md
@@ -47,6 +47,7 @@ Example: To set the directory value please add this line to your .htconfig.php:
 * **frontend_worker_timeout** - Value in minutes after we think that a frontend task was killed by the webserver. Default value is 10.
 * **hsts** (Boolean) - Enables the sending of HTTP Strict Transport Security headers
 * **ignore_cache** (Boolean) - For development only. Disables the item cache.
+* **ipv4_resolve** (Boolean) - Resolve IPV4 addresses only. Don't resolve to IPV6. Default value is false.
 * **like_no_comment** (Boolean) - Don't update the "commented" value of an item when it is liked.
 * **local_block** (Boolean) - Used in conjunction with "block_public".
 * **local_search** (Boolean) - Blocks search for users who are not logged in to prevent crawlers from blocking your system.
diff --git a/include/dba.php b/include/dba.php
index bc38029351..a10f18aba7 100644
--- a/include/dba.php
+++ b/include/dba.php
@@ -1259,6 +1259,24 @@ class dba {
 		return $data;
 	}
 
+	/**
+	 * @brief Returns the error number of the last query
+	 *
+	 * @return string Error number (0 if no error)
+	 */
+	public static function errorNo() {
+		return self::$dbo->errorno;
+	}
+
+	/**
+	 * @brief Returns the error message of the last query
+	 *
+	 * @return string Error message ('' if no error)
+	 */
+	public static function errorMessage() {
+		return self::$dbo->error;
+	}
+
 	/**
 	 * @brief Closes the current statement
 	 *
diff --git a/include/poller.php b/include/poller.php
index aa8763af33..312347d71a 100644
--- a/include/poller.php
+++ b/include/poller.php
@@ -248,7 +248,9 @@ function poller_execute($queue) {
 		poller_exec_function($queue, $funcname, $argv);
 
 		$stamp = (float)microtime(true);
-		dba::update('workerqueue', array('done' => true), array('id' => $queue["id"]));
+		if (dba::update('workerqueue', array('done' => true), array('id' => $queue["id"]))) {
+			Config::set('system', 'last_poller_execution', datetime_convert());
+		}
 		$poller_db_duration = (microtime(true) - $stamp);
 	} else {
 		logger("Function ".$funcname." does not exist");
diff --git a/mod/admin.php b/mod/admin.php
index 49596578b8..2fb2fea830 100644
--- a/mod/admin.php
+++ b/mod/admin.php
@@ -626,6 +626,15 @@ function admin_page_summary(App $a) {
 		$warningtext[] = t('The database update failed. Please run "php include/dbstructure.php update" from the command line and have a look at the errors that might appear.');
 	}
 
+	$last_worker_call = Config::get('system', 'last_poller_execution', false);
+	if (!$last_worker_call) {
+		$showwarning = true;
+		$warningtext[] = t('The worker was never executed. Please check your database structure!');
+	} elseif ((strtotime(datetime_convert()) - strtotime($last_worker_call)) > 60 * 60) {
+		$showwarning = true;
+		$warningtext[] = sprintf(t('The last worker execution was on %s UTC. This is older than one hour. Please check your crontab settings.'), $last_worker_call);
+	}
+
 	$r = q("SELECT `page-flags`, COUNT(`uid`) AS `count` FROM `user` GROUP BY `page-flags`");
 	$accounts = array(
 		array(t('Normal Account'), 0),