Octo.exe fails to create release on Octopus 0.9.620.3

Using Octo.exe to create a release, as in:

Octo.exe create-release --project=Example --version=1.0.2555 --server=http://octopus-test.localdomain/

Appears to be broken on Octopus 0.9.620.3.

The server doesn’t seem to log anything, but attaching windbg shows this exception being thrown:

(d04.13c0): CLR exception - code e0434352 (first chance)
Exception object: 000000018172f230
Exception type:   System.InvalidOperationException
Message:          Sequence contains no matching element
InnerException:   
StackTrace (generated):
    SP               IP               Function
    00000000046FD6A0 000007FEF6AD8542 System_Core_ni!System.Linq.Enumerable.First[[System.__Canon, mscorlib]](System.Collections.Generic.IEnumerable`1, System.Func`2)+0x152
    00000000046FD700 000007FF009A3F56 Octopus_Portal!Octopus.Portal.Areas.Api.Controllers.ReleasesController.Add(Int32, Octopus.Portal.Areas.Api.Models.ReleaseResource)+0x636
    00000000046FD7C0 000007FF00A33C54 UNKNOWN!DynamicClass.lambda_method(System.Runtime.CompilerServices.Closure, System.Web.Mvc.ControllerBase, System.Object[])+0xa4
    00000000046FD810 000007FF00744B98 System_Web_Mvc!System.Web.Mvc.ReflectedActionDescriptor.Execute(System.Web.Mvc.ControllerContext, System.Collections.Generic.IDictionary`2)+0xf8
    00000000046FD860 000007FF007449A7 System_Web_Mvc!System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(System.Web.Mvc.ControllerContext, System.Web.Mvc.ActionDescriptor, System.Collections.Generic.IDictionary`2)+0x27
    00000000046FD8A0 000007FF0074488D System_Web_Mvc!System.Web.Mvc.ControllerActionInvoker+<>c__DisplayClass15.b__12()+0x7d