diff --git a/src/Connection.php b/src/Connection.php
index 8853721..7812fd3 100644
--- a/src/Connection.php
+++ b/src/Connection.php
@@ -180,6 +180,8 @@ protected function init()
         }
 
         $this->infoMessage = $this->getMessage($config->timeout);
+        assert($this->infoMessage instanceof Info);
+
         if (isset($this->infoMessage->nonce) && $this->authenticator) {
             $this->connectMessage->sig = $this->authenticator->sign($this->infoMessage->nonce);
             $this->connectMessage->nkey = $this->authenticator->getPublicKey();