Unsupported operand types: int + string

From time to time sentry logs this error: Unsupported operand types: int + string

Stacktrace:

$payload = $this->redis->hget("$this->channel.messages", $id);
list($ttr, $message) = explode(';', $payload, 2);
$this->redis->zadd("$this->channel.reserved", time() + $ttr, $id);

https://github.com/yiisoft/yii2-queue/blob/master/src/drivers/redis/Queue.php#L160

For whatever reason $ttr seems to be a string instead of an int. Should we maybe typecast $ttr or throw an exception?

Inspect src/drivers/redis/Queue.php around line 160, starting with how the payload is split and how $ttr is obtained. Trace the Redis queue reservation path and determine how the integer/string mismatch should be handled; the issue is done when this Sentry error is prevented with an agreed behavior for invalid or string TTR values.