Fix intermittent panic connecting to Duo (#3832)
Fix intermittent panic connecting to Duo (#3832)

Fixes #2030
mgk/vault,mgk/vault,rnaveiras/vault,hartsock/vault,hartsock/vault,hartsock/vault,joelthompson/vault,rnaveiras/vault,hashicorp/vault,quixoten/vault,naunga/vault,rnaveiras/vault,hashicorp/vault,mgk/vault,mgk/vault,kingland/vault,Aloomaio/vault,kingland/vault,kingland/vault,hartsock/vault,Aloomaio/vault,quixoten/vault,kingland/vault,Aloomaio/vault,hashicorp/vault,rnaveiras/vault,naunga/vault,joelthompson/vault,kingland/vault,hartsock/vault,hashicorp/vault,hashicorp/vault,joelthompson/vault,joelthompson/vault,quixoten/vault,rnaveiras/vault,hashicorp/vault,quixoten/vault,Aloomaio/vault