Guzzle is trying to serialize a PDO object, fails with a PDO Exception about eightpointsguzzlebundle HOT 10 CLOSED

Exception in DataCollector.php line 35:
Serialization of 'Closure' is not allowed
in DataCollector.php line 35
at SplObjectStorage->serialize()
at serialize(array('logs' => array('http://****/app_dev.php/admin/login' => object(LogGroup)), 'callCount' => '0')) in DataCollector.php line 35
at DataCollector->serialize()
at serialize(array('token' => 'd6c559', 'parent' => null, 'children' => array(), 'data' => array('form' => object(FormDataCollector), 'config' => object(ConfigDataCollector), 'request' => object(RequestDataCollector), 'ajax' => object(AjaxDataCollector), 'exception' => object(ExceptionDataCollector), 'events' => object(EventDataCollector), 'logger' => object(LoggerDataCollector), 'time' => object(TimeDataCollector), 'memory' => object(MemoryDataCollector), 'router' => object(RouterDataCollector), 'security' => object(SecurityDataCollector), 'swiftmailer' => object(MessageDataCollector), 'db' => object(DoctrineDataCollector), 'guzzle' => object(HttpDataCollector), 'ladybug' => object(LadybugDataCollector)), 'ip' => '195.132.182.57', 'method' => 'GET', 'url' => 'http://******/app_dev.php/admin/login', 'time' => '1432054784')) in FileProfilerStorage.php line 153
at FileProfilerStorage->write(object(Profile)) in Profiler.php line 119
at Profiler->saveProfile(object(Profile)) in ProfilerListener.php line 139
at ProfilerListener->onKernelTerminate(object(PostResponseEvent), 'kernel.terminate', object(TraceableEventDispatcher))
at call_user_func(array(object(ProfilerListener), 'onKernelTerminate'), object(PostResponseEvent), 'kernel.terminate', object(TraceableEventDispatcher)) in WrappedListener.php line 61
at WrappedListener->__invoke(object(PostResponseEvent), 'kernel.terminate', object(ContainerAwareEventDispatcher))
at call_user_func(object(WrappedListener), object(PostResponseEvent), 'kernel.terminate', object(ContainerAwareEventDispatcher)) in classes.php line 1790
at EventDispatcher->doDispatch(array(object(WrappedListener), object(WrappedListener)), 'kernel.terminate', object(PostResponseEvent)) in classes.php line 1723
at EventDispatcher->dispatch('kernel.terminate', object(PostResponseEvent)) in classes.php line 1884
at ContainerAwareEventDispatcher->dispatch('kernel.terminate', object(PostResponseEvent)) in TraceableEventDispatcher.php line 112
at TraceableEventDispatcher->dispatch('kernel.terminate', object(PostResponseEvent)) in bootstrap.php.cache line 2995
at HttpKernel->terminate(object(Request), object(Response)) in bootstrap.php.cache line 2357
at Kernel->terminate(object(Request), object(Response)) in app_dev.php line 31