ArgumentOutOfRangeException in StringBuilder.ToString() after updating from 1.8.0 to 1.8.1

After updating from 1.8.0 to 1.8.1 I get this error. The internet expects the access to the StringBuilder is not thread save.

Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'chunkLength') System.ArgumentOutOfRangeException ArgumentOutOfRangeException System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'chunkLength')
at System.Text.StringBuilder.ToString()
at Apache.NMS.AMQP.Message.DefaultMessageIdBuilder.CreateMessageId(String producerId, Int64 messageSequence)
at Apache.NMS.AMQP.NmsSession.Send(NmsMessageProducer producer, IDestination destination, IMessage original, MsgDeliveryMode deliveryMode, MsgPriority priority, TimeSpan timeToLive, Boolean disableMessageId, Boolean disableMessageTimestamp)
at Apache.NMS.AMQP.NmsMessageProducer.Send(IDestination destination, IMessage message, MsgDeliveryMode deliveryMode, MsgPriority priority, TimeSpan timeToLive)