diff --git a/src/danog/MadelineProto/API.php b/src/danog/MadelineProto/API.php
index 26939cd7..1e422e72 100644
--- a/src/danog/MadelineProto/API.php
+++ b/src/danog/MadelineProto/API.php
@@ -136,6 +136,7 @@ class API extends InternalDoc
             $unserialized->session = $session;
             APIWrapper::link($this, $unserialized);
             APIWrapper::link($this->wrapper, $this);
+            AbstractAPIFactory::link($this->wrapper->getFactory(), $this);
             if (isset($this->API)) {
                 $this->storage = $this->API->storage ?? $this->storage;
 
diff --git a/src/danog/MadelineProto/DataCenter.php b/src/danog/MadelineProto/DataCenter.php
index 51b584e2..f3a4758e 100644
--- a/src/danog/MadelineProto/DataCenter.php
+++ b/src/danog/MadelineProto/DataCenter.php
@@ -34,6 +34,7 @@ use Amp\Http\Client\HttpClientBuilder;
 use Amp\Http\Client\Request;
 use Amp\Socket\ConnectContext;
 use Amp\Socket\DnsConnector;
+use Amp\Websocket\Client\Handshake;
 use Amp\Websocket\Client\Rfc6455Connector;
 use danog\MadelineProto\MTProto\PermAuthKey;
 use danog\MadelineProto\MTProto\TempAuthKey;
@@ -233,7 +234,9 @@ class DataCenter
             $this->nonProxiedDoHClient = Magic::$altervista || Magic::$zerowebhost ? new Rfc1035StubResolver() : new Rfc8484StubResolver($nonProxiedDoHConfig);
 
             $this->dnsConnector = new DnsConnector(new Rfc1035StubResolver());
-            $this->webSocketConnnector = new Rfc6455Connector($this->HTTPClient);
+            if (\class_exists(Rfc6455Connector::class)) {
+                $this->webSocketConnnector = new Rfc6455Connector($this->HTTPClient);
+            }
         }
     }
     public function dcConnect(string $dc_number, int $id = -1): \Generator
@@ -265,7 +268,7 @@ class DataCenter
                 if (\MADELINEPROTO_TEST === 'pony') {
                     throw $e;
                 }
-                $this->API->logger->logger("Connection failed ({$dc_number}): " . $e->getMessage(), \danog\MadelineProto\Logger::ERROR);
+                $this->API->logger->logger("Connection failed ({$dc_number}): ".$e->getMessage(), \danog\MadelineProto\Logger::ERROR);
             }
         }
         throw new Exception("Could not connect to DC {$dc_number}");
@@ -468,6 +471,9 @@ class DataCenter
                                 $stream[1] = $useDoH ? new DoHConnector($this, $ctx) : $this->dnsConnector;
                             }
                             if (\in_array($stream[0], [WsStream::class, WssStream::class]) && $stream[1] === []) {
+                                if (!\class_exists(Handshake::class)) {
+                                    throw new Exception('Please install amphp/websocket-client by running "composer require amphp/websocket-client:dev-master"');
+                                }
                                 $stream[1] = $this->webSocketConnnector;
                             }
                             $ctx->addStream(...$stream);
@@ -477,8 +483,8 @@ class DataCenter
                 }
             }
         }
-        if (isset($this->dclist[$test][$ipv6][$dc_number . '_bk']['ip_address'])) {
-            $ctxs = \array_merge($ctxs, $this->generateContexts($dc_number . '_bk'));
+        if (isset($this->dclist[$test][$ipv6][$dc_number.'_bk']['ip_address'])) {
+            $ctxs = \array_merge($ctxs, $this->generateContexts($dc_number.'_bk'));
         }
         if (empty($ctxs)) {
             unset($this->sockets[$dc_number]);
diff --git a/src/danog/MadelineProto/Loop/Update/FeedLoop.php b/src/danog/MadelineProto/Loop/Update/FeedLoop.php
index f79738ae..0a6bfe62 100644
--- a/src/danog/MadelineProto/Loop/Update/FeedLoop.php
+++ b/src/danog/MadelineProto/Loop/Update/FeedLoop.php
@@ -138,7 +138,7 @@ class FeedLoop extends ResumableSignalLoop
         foreach ($updates as $update) {
             $res = $this->feedSingle($update);
             if ($res instanceof \Generator) {
-                $res = yield $res;
+                $res = yield from $res;
             }
             $result[$res] = true;
         }
diff --git a/src/danog/MadelineProto/Wrappers/Events.php b/src/danog/MadelineProto/Wrappers/Events.php
index 0bf64e31..937857b4 100644
--- a/src/danog/MadelineProto/Wrappers/Events.php
+++ b/src/danog/MadelineProto/Wrappers/Events.php
@@ -20,6 +20,7 @@
 namespace danog\MadelineProto\Wrappers;
 
 use danog\MadelineProto\EventHandler;
+use danog\MadelineProto\Tools;
 
 /**
  * Event handler.
@@ -84,6 +85,9 @@ trait Events
         $this->settings['updates']['callback'] = [$this, 'eventUpdateHandler'];
         $this->settings['updates']['handle_updates'] = true;
         $this->settings['updates']['run_callback'] = true;
+        if (method_exists($this->event_handler_instance, 'onStart')) {
+            Tools::callFork($this->event_handler_instance->onStart());
+        }
         if ($this->inited()) {
             $this->startUpdateSystem();
         }
diff --git a/src/danog/MadelineProto/Wrappers/Loop.php b/src/danog/MadelineProto/Wrappers/Loop.php
index daf130d0..023b15e4 100644
--- a/src/danog/MadelineProto/Wrappers/Loop.php
+++ b/src/danog/MadelineProto/Wrappers/Loop.php
@@ -220,4 +220,4 @@ trait Loop
             \fastcgi_finish_request();
         }
     }
-}
\ No newline at end of file
+}
diff --git a/tests/makephar.sh b/tests/makephar.sh
index 4660d79d..bc705fe4 100755
--- a/tests/makephar.sh
+++ b/tests/makephar.sh
@@ -60,7 +60,13 @@ composer config platform.php "7.4"
 composer clearcache
 composer update
 composer require amphp/mysql
-[ $PHP_MAJOR_VERSION -eq 5 ] && composer require dstuecken/php7ify && composer require symfony/polyfill-php70
+[ $PHP_MAJOR_VERSION -eq 5 ] && {
+    composer require dstuecken/php7ify
+    composer require symfony/polyfill-php70
+    composer require symfony/polyfill-php71
+    composer require symfony/polyfill-php72
+    composer require symfony/polyfill-php73
+}
 [ $PHP_MAJOR_VERSION -eq 7 ] && [ $PHP_MINOR_VERSION -eq 0 ] && {
     composer require symfony/polyfill-php71
     composer require symfony/polyfill-php72