diff --git a/examples/crossbar_session/monitor.php b/examples/crossbar_session/monitor.php
index 2825433..5405f35 100644
--- a/examples/crossbar_session/monitor.php
+++ b/examples/crossbar_session/monitor.php
@@ -29,7 +29,7 @@
 );
 
 $connection->on('open', function (ClientSession $session) use ($connection, &$timer) {
-    $sessionMonitor = new SessionMonitor(new Adapter($session, new PromiseFactory()));
+    $sessionMonitor = SessionMonitor::create(new Adapter($session, new PromiseFactory()));
 
     echo PHP_EOL . "******** SESSION MONITOR STARTED ********" . PHP_EOL;
     $sessionMonitor->on('start', function ($l) {
@@ -42,12 +42,23 @@
         print_r($l);
     });
 
-    $sessionMonitor->on('join', function ($sessionData) {
+    $sessionMonitor->on('join', function ($sessionData) use ($sessionMonitor) {
         echo PHP_EOL . "JOIN: {$sessionData->session}" . PHP_EOL;
+
+        $sessionMonitor->getSessionIds()->then(function (array $sessions) {
+
+            echo "SESSIONS : " . count($sessions) . PHP_EOL;
+
+        });
     });
 
-    $sessionMonitor->on('leave', function ($sessionId) {
+    $sessionMonitor->on('leave', function ($sessionId) use ($sessionMonitor) {
         echo PHP_EOL . "LEAVE: $sessionId" . PHP_EOL;
+        $sessionMonitor->getSessionIds()->then(function (array $sessions) {
+
+            echo "SESSIONS : " . count($sessions) . PHP_EOL;
+
+        });
     });
 
     $sessionMonitor->on('error', function ($l) {
diff --git a/examples/thruway_internal_session_monitor/InternalSessionMonitor.php b/examples/thruway_internal_session_monitor/InternalSessionMonitor.php
index 62e9b91..595c709 100644
--- a/examples/thruway_internal_session_monitor/InternalSessionMonitor.php
+++ b/examples/thruway_internal_session_monitor/InternalSessionMonitor.php
@@ -51,9 +51,9 @@ public function onSessionStart($session, $transport)
             print_r($l);
         });
 
-        $sessionMonitor->on('error', function ($l) {
-            echo PHP_EOL . "ERROR: " . PHP_EOL;
-            print_r($l);
+        $sessionMonitor->on('error', function ($l, $i = 'default') {
+            echo PHP_EOL . "ERROR REQUEST $i : " . PHP_EOL;
+            print_r(func_get_args());
         });
 
         $sessionMonitor->start();
diff --git a/src/Tidal/WampWatch/SessionMonitor.php b/src/Tidal/WampWatch/SessionMonitor.php
index af99656..44057fe 100644
--- a/src/Tidal/WampWatch/SessionMonitor.php
+++ b/src/Tidal/WampWatch/SessionMonitor.php
@@ -12,8 +12,10 @@
 namespace Tidal\WampWatch;
 
 use Evenement\EventEmitterInterface;
+use Thruway\Message\ErrorMessage;
 use Tidal\WampWatch\ClientSessionInterface as ClientSession;
 use Tidal\WampWatch\Adapter\React\PromiseAdapter;
+use Tidal\WampWatch\Async\PromiseInterface;
 
 /**
  * Description of SessionMonitor.
@@ -62,7 +64,7 @@ public function __construct(ClientSession $session)
      *
      * @param   $sessionId
      *
-     * @return PromiseAdapter
+     * @return PromiseInterface
      */
     public function getSessionInfo($sessionId)
     {
@@ -72,8 +74,8 @@ function ($res) {
 
                 return $res;
             },
-            function ($error) {
-                $this->emit('error', [$error]);
+            function (ErrorMessage $error) use ($sessionId) {
+                $this->emit('error', [$error, $sessionId]);
             }
         );
     }
@@ -250,4 +252,9 @@ protected function removeOwnSessionId(array $sessionsIds)
 
         return $sessionsIds;
     }
+
+    public static function create(ClientSession $session)
+    {
+        return new self($session);
+    }
 }
diff --git a/tests/integration/crossbar/CrosssbarSessionMonitorTest.php b/tests/integration/crossbar/CrosssbarSessionMonitorTest.php
index a3b018c..fd31b01 100644
--- a/tests/integration/crossbar/CrosssbarSessionMonitorTest.php
+++ b/tests/integration/crossbar/CrosssbarSessionMonitorTest.php
@@ -44,6 +44,9 @@ public function test_onstart()
 
         $this->connection->open();
 
+        // wait for connection to be established
+        sleep(1);
+
         $this->assertTrue(is_array($sessionIds));
     }
 
@@ -79,6 +82,9 @@ public function test_onjoin()
 
         $this->connection->open();
 
+        // wait for connection to be established
+        sleep(1);
+
         $this->assertEquals($this->clientSessionId, $this->monitoredSessionId);
     }
 
@@ -114,6 +120,9 @@ public function test_onleave()
 
         $this->connection->open();
 
+        // wait for connection to be established
+        sleep(1);
+
         $this->assertEquals($this->clientSessionId, $this->monitoredSessionId);
     }
 }
diff --git a/tests/integration/crossbar/CrosssbarSubscriptionMonitorTest.php b/tests/integration/crossbar/CrosssbarSubscriptionMonitorTest.php
index 1e74ce0..59366a5 100644
--- a/tests/integration/crossbar/CrosssbarSubscriptionMonitorTest.php
+++ b/tests/integration/crossbar/CrosssbarSubscriptionMonitorTest.php
@@ -75,6 +75,9 @@ public function test_onstart()
 
         $this->connection->open();
 
+        // wait for connection to be established
+        sleep(1);
+
         $this->validateSubscriptionInfo($this->initialSubscriptionInfo);
     }
 
@@ -101,6 +104,9 @@ public function test_onstart_delivers_current_list()
 
         $clientConnection->open();
 
+        // wait for connection to be established
+        sleep(1);
+
         $this->validateSubscriptionInfo($this->initialSubscriptionInfo);
         $this->assertArraySubset([$subscriptionId], $this->initialSubscriptionInfo->exact);
     }
@@ -131,6 +137,9 @@ public function test_oncreate()
 
         $this->getConnection()->open();
 
+        // wait for connection to be established
+        sleep(1);
+
         $this->assertInternalType('int', $this->creatorSessionId);
         $this->assertInstanceOf(\stdClass::class, $this->clientSubscriptionInfo);
         $this->assertAttributeEquals($this->testTopicName, 'uri', $this->clientSubscriptionInfo);
@@ -207,6 +216,9 @@ public function test_onunsubscribe()
 
         $this->connection->open();
 
+        // wait for connection to be established
+        sleep(1);
+
         $this->assertInternalType('int', $sessionId);
         $this->assertInternalType('int', $subscriptionId);
     }
@@ -256,6 +268,9 @@ public function test_ondelete()
 
         $this->connection->open();
 
+        // wait for connection to be established
+        sleep(1);
+
         $this->assertInternalType('int', $sessionId);
         $this->assertInternalType('int', $subscriptionId);
     }
diff --git a/tests/unit/SessionMonitorTest.php b/tests/unit/SessionMonitorTest.php
index 8de0ba1..6c249df 100644
--- a/tests/unit/SessionMonitorTest.php
+++ b/tests/unit/SessionMonitorTest.php
@@ -17,6 +17,7 @@
 use Tidal\WampWatch\Stub\ClientSessionStub;
 use PHPUnit_Framework_TestCase;
 use stdClass;
+use Thruway\Message;
 
 /**
  * @author Timo Michna <timomichna@yahoo.de>
@@ -401,12 +402,13 @@ public function test_get_sessioninfo_fail_emits_event()
 
         $monitor->getSessionInfo(654);
 
-        $sessionInfo = new stdClass();
-        $sessionInfo->session = 654;
+        $errorMessage = $this->getMockBuilder(Message\ErrorMessage::class)
+            ->disableOriginalConstructor()
+            ->getMock();
 
-        $stub->failCall(SessionMonitor::SESSION_INFO_TOPIC, $sessionInfo);
+        $stub->failCall(SessionMonitor::SESSION_INFO_TOPIC, $errorMessage);
 
-        $this->assertSame($sessionInfo, $response);
+        $this->assertSame($errorMessage, $response);
     }
 
     public function test_invalid_sessioninfo_does_not_get_added()