Additional check for stream resource

Author: EvilFreelancer

src/SocketTrait.php

@@ -54,7 +54,7 @@ private function openSocket(): void
         );
 
         // Throw error is socket is not initiated
-        if (false === $socketClient) {
+        if (false === $socketClient || !is_resource($socketClient)) {
             throw new ConnectException('Unable to establish socket session, ' . $socketErrorString, $socketErrorNumber);
         }