diff --git a/lib/imqueuehandler.php b/lib/imqueuehandler.php
index 2df25ac9f4..b1eeb0ac36 100644
--- a/lib/imqueuehandler.php
+++ b/lib/imqueuehandler.php
@@ -17,7 +17,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
+defined('GNUSOCIAL') || die();
 
 /**
  * Common superclass for all IM sending queue handlers.
@@ -35,8 +35,13 @@ class ImQueueHandler extends QueueHandler
      * @param Notice $notice
      * @return boolean success
      */
-    function handle($notice)
+    function handle($notice): bool
     {
+        if (!($notice instanceof Notice)) {
+            common_log(LOG_ERR, "Got a bogus notice, not broadcasting");
+            return true;
+        }
+
         $this->plugin->broadcastNotice($notice);
         if ($notice->isLocal()) {
             $this->plugin->publicNotice($notice);
diff --git a/lib/pingqueuehandler.php b/lib/pingqueuehandler.php
index 4e4d74cb1a..7f5b11ea6a 100644
--- a/lib/pingqueuehandler.php
+++ b/lib/pingqueuehandler.php
@@ -17,20 +17,25 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) {
-    exit(1);
-}
+defined('GNUSOCIAL') || die();
 
 /**
  * Queue handler for pushing new notices to ping servers.
  */
 class PingQueueHandler extends QueueHandler {
 
-    function transport() {
+    function transport()
+    {
         return 'ping';
     }
 
-    function handle($notice) {
+    function handle($notice): bool
+    {
+        if (!($notice instanceof Notice)) {
+            common_log(LOG_ERR, "Got a bogus notice, not broadcasting");
+            return true;
+        }
+
         require_once INSTALLDIR . '/lib/ping.php';
         return ping_broadcast_notice($notice);
     }
diff --git a/lib/pluginqueuehandler.php b/lib/pluginqueuehandler.php
index dcd07d7208..46b61d6a96 100644
--- a/lib/pluginqueuehandler.php
+++ b/lib/pluginqueuehandler.php
@@ -17,7 +17,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-if (!defined('GNUSOCIAL')) { exit(1); }
+defined('GNUSOCIAL') || die();
 
 /**
  * Queue handler for letting plugins handle stuff.
@@ -40,8 +40,13 @@ class PluginQueueHandler extends QueueHandler
         return 'plugin';
     }
 
-    function handle($notice)
+    function handle($notice): bool
     {
+        if (!($notice instanceof Notice)) {
+            common_log(LOG_ERR, "Got a bogus notice, not broadcasting");
+            return true;
+        }
+
         try {
             Event::handle('HandleQueuedNotice', array(&$notice));
         } catch (NoProfileException $unp) {
diff --git a/lib/queuehandler.php b/lib/queuehandler.php
index 2194dd1618..47161a987c 100644
--- a/lib/queuehandler.php
+++ b/lib/queuehandler.php
@@ -46,7 +46,7 @@ class QueueHandler
      * @param mixed $object
      * @return boolean true on success, false on failure
      */
-    function handle($object)
+    function handle($object): bool
     {
         return true;
     }
diff --git a/lib/smsqueuehandler.php b/lib/smsqueuehandler.php
index 6085d2b4ac..1df7011e3c 100644
--- a/lib/smsqueuehandler.php
+++ b/lib/smsqueuehandler.php
@@ -17,9 +17,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) {
-    exit(1);
-}
+defined('GNUSOCIAL') || die();
 
 /**
  * Queue handler for pushing new notices to local subscribers using SMS.
@@ -31,8 +29,13 @@ class SmsQueueHandler extends QueueHandler
         return 'sms';
     }
 
-    function handle($notice)
+    function handle($notice): bool
     {
+        if (!($notice instanceof Notice)) {
+            common_log(LOG_ERR, "Got a bogus notice, not broadcasting");
+            return true;
+        }
+
     	require_once(INSTALLDIR.'/lib/mail.php');
         return mail_broadcast_notice_sms($notice);
     }
diff --git a/plugins/OStatus/lib/ostatusqueuehandler.php b/plugins/OStatus/lib/ostatusqueuehandler.php
index 3ad6b3b2ab..74db1924fa 100644
--- a/plugins/OStatus/lib/ostatusqueuehandler.php
+++ b/plugins/OStatus/lib/ostatusqueuehandler.php
@@ -17,9 +17,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-if (!defined('STATUSNET')) {
-    exit(1);
-}
+defined('GNUSOCIAL') || die();
 
 /**
  * Prepare WebSub and Salmon distributions for an outgoing message.
@@ -46,9 +44,12 @@ class OStatusQueueHandler extends QueueHandler
         return 'ostatus';
     }
 
-    function handle($notice)
+    function handle($notice): bool
     {
-        assert($notice instanceof Notice);
+        if (!($notice instanceof Notice)) {
+            common_log(LOG_ERR, "Got a bogus notice, not distributing");
+            return true;
+        }
 
         $this->notice = $notice;
         $this->user = User::getKV('id', $notice->profile_id);
diff --git a/plugins/OStatus/lib/pushinqueuehandler.php b/plugins/OStatus/lib/pushinqueuehandler.php
index 4946186cf4..0ffb43b14a 100644
--- a/plugins/OStatus/lib/pushinqueuehandler.php
+++ b/plugins/OStatus/lib/pushinqueuehandler.php
@@ -17,7 +17,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-if (!defined('GNUSOCIAL')) { exit(1); }
+defined('GNUSOCIAL') || die();
 
 /**
  * Process a feed distribution POST from a WebSub (previously PuSH) hub.
@@ -31,9 +31,12 @@ class PushInQueueHandler extends QueueHandler
         return 'pushin';
     }
 
-    function handle($data)
+    function handle($data): bool
     {
-        assert(is_array($data));
+        if (!is_array($data)) {
+            common_log(LOG_ERR, "Got bogus data, not processing");
+            return true;
+        }
 
         $feedsub_id = $data['feedsub_id'];
         $post = $data['post'];
diff --git a/plugins/RSSCloud/lib/rsscloudqueuehandler.php b/plugins/RSSCloud/lib/rsscloudqueuehandler.php
index 8a09977489..63f6559412 100644
--- a/plugins/RSSCloud/lib/rsscloudqueuehandler.php
+++ b/plugins/RSSCloud/lib/rsscloudqueuehandler.php
@@ -17,7 +17,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
+defined('GNUSOCIAL') || die();
 
 class RSSCloudQueueHandler extends QueueHandler
 {
@@ -26,8 +26,13 @@ class RSSCloudQueueHandler extends QueueHandler
         return 'rsscloud';
     }
 
-    function handle($notice)
+    function handle($notice): bool
     {
+        if (!($notice instanceof Notice)) {
+            common_log(LOG_ERR, "Got a bogus notice, not using");
+            return true;
+        }
+
         try {
             $profile = $notice->getProfile();
         } catch (Exception $e) {
diff --git a/plugins/SubMirror/lib/mirrorqueuehandler.php b/plugins/SubMirror/lib/mirrorqueuehandler.php
index 550986b444..abdc259d8f 100644
--- a/plugins/SubMirror/lib/mirrorqueuehandler.php
+++ b/plugins/SubMirror/lib/mirrorqueuehandler.php
@@ -17,6 +17,8 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+defined('GNUSOCIAL') || die();
+
 /**
  * Check for subscription mirroring options on each newly seen post!
  *
@@ -30,8 +32,13 @@ class MirrorQueueHandler extends QueueHandler
         return 'mirror';
     }
 
-    function handle($notice)
+    function handle($notice): bool
     {
+        if (!($notice instanceof Notice)) {
+            common_log(LOG_ERR, "Got a bogus notice, not mirroring");
+            return true;
+        }
+
         $mirror = new SubMirror();
         $mirror->subscribed = $notice->profile_id;
         if ($mirror->find()) {
diff --git a/plugins/TwitterBridge/lib/twitterqueuehandler.php b/plugins/TwitterBridge/lib/twitterqueuehandler.php
index bba1b8b2bc..2c6c36906f 100644
--- a/plugins/TwitterBridge/lib/twitterqueuehandler.php
+++ b/plugins/TwitterBridge/lib/twitterqueuehandler.php
@@ -17,7 +17,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
+defined('GNUSOCIAL') || die();
 
 require_once dirname(__DIR__) . '/twitter.php';
 
@@ -28,8 +28,13 @@ class TwitterQueueHandler extends QueueHandler
         return 'twitter';
     }
 
-    function handle($notice)
+    function handle($notice): bool
     {
+        if (!($notice instanceof Notice)) {
+            common_log(LOG_ERR, "Got a bogus notice, not broadcasting");
+            return true;
+        }
+
         $ok = broadcast_twitter($notice);
         return $ok || common_config('twitter', 'ignore_errors');
     }