Undefined offset: 3 in Connection.php, Uncaught Nats\Exception: Subscription not found

[donkeywon]

I use client to send 100k messages, the gnatsd server received all messages, but phpnats only handled about 65k messages, then php throw a error like this

Notice: Undefined offset: 3 in /var/www/html/question_tp/vendor/repejota/nats/src/Nats/Connection.php on line 405

Call Stack:
    0.0002     363904   1. {main}() /var/www/html/question_tp/test.php:0
    0.0025     537336   2. Nats\Connection->wait() /var/www/html/question_tp/test.php:52
   54.0128     538184   3. Nats\Connection->handleMSG() /var/www/html/question_tp/vendor/repejota/nats/src/Nats/Connection.php:603


Fatal error: Uncaught Nats\Exception: Subscription not found: 9c51b5c00 in /var/www/html/question_tp/vendor/repejota/nats/src/Nats/Exception.php on line 48

Nats\Exception: Subscription not found: 9c51b5c00 in /var/www/html/question_tp/vendor/repejota/nats/src/Nats/Exception.php on line 48

Call Stack:
    0.0002     363904   1. {main}() /var/www/html/question_tp/test.php:0
    0.0025     537336   2. Nats\Connection->wait() /var/www/html/question_tp/test.php:52
   54.0128     538184   3. Nats\Connection->handleMSG() /var/www/html/question_tp/vendor/repejota/nats/src/Nats/Connection.php:603

here is part of my client script, from line 26

for ($i = 0; $i < 100000; $i++) {
    $content = $faker->md5;
    $client->publish('queue', $content);
    fwrite($file, $i . " " . $content . "\n");
}

here is part of my server script, from line 38

$client->subscribe(
    'queue',
    function ($message) use (&$mysqli, &$count, &$file, &$content) {
	$count++;
	$content = $message->getBody();
        if ($mysqli->query("INSERT INTO test_nats (nats_field1) VALUES ('" . $content . "')") === false) {
            fwrite($file, "Insert failed: $count $content \n");
	} else {
            printf("%u\n", $count);
	    fwrite($file, $count . " " . $content . "\n");
	}
    }
);

$client->wait();