diff --git a/include/delivery.php b/include/delivery.php
index 1f5883c266..e32a9346cd 100644
--- a/include/delivery.php
+++ b/include/delivery.php
@@ -37,6 +37,19 @@ function delivery_run($argv, $argc){
 	$item_id    = intval($argv[2]);
 	$contact_id = intval($argv[3]);
 
+	// Some other process may have delivered this item already.
+
+	$r = q("select * from deliverq where cmd = '%s' and item = %d and contact = %d limit 1",
+		dbesc($cmd),
+		dbesc($item_id),
+		dbesc($contact_id)
+	);
+	if(! count($r)) {
+		return;
+	}	
+
+	// It's ours to deliver. Remove it from the queue.
+
 	q("delete from deliverq where cmd = '%s' and item = %d and contact = %d limit 1",
 		dbesc($cmd),
 		dbesc($item_id),
diff --git a/include/queue.php b/include/queue.php
index 0cb6fcec21..1ac1e7d48c 100644
--- a/include/queue.php
+++ b/include/queue.php
@@ -3,18 +3,18 @@ require_once("boot.php");
 require_once('include/queue_fn.php');
 
 function queue_run($argv, $argc){
-  global $a, $db;
+	global $a, $db;
 
-  if(is_null($a)){
-    $a = new App;
-  }
+	if(is_null($a)){
+		$a = new App;
+	}
   
-  if(is_null($db)){
-    @include(".htconfig.php");
-    require_once("dba.php");
-    $db = new dba($db_host, $db_user, $db_pass, $db_data);
-    unset($db_host, $db_user, $db_pass, $db_data);
-  };
+	if(is_null($db)){
+		@include(".htconfig.php");
+		require_once("dba.php");
+		$db = new dba($db_host, $db_user, $db_pass, $db_data);
+		unset($db_host, $db_user, $db_pass, $db_data);
+	};
 
 
 	require_once("session.php");
@@ -42,7 +42,6 @@ function queue_run($argv, $argc){
 	if(! $interval)
 		$interval = 2;
 
-
 	$r = q("select * from deliverq where 1");
 	if(count($r)) {
 		foreach($r as $rr) {