Raise.Event<AsyncEventArgs>() fails

Raise.Event<AsyncEventArgs>() fails

Booyah.ShouldJustWork : FailedSystem.InvalidOperationException : Collection was modified; enumeration operation may not execute.
at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
at System.Collections.Generic.List`1.Enumerator.MoveNext()
at NSubstitute.Routing.Handlers.RaiseEventHandler.Handle(ICall call) in d:\Git\NSubstitute\Source\NSubstitute\Routing\Handlers\RaiseEventHandler.cs: line 27
at NSubstitute.Routing.Route.<>c__DisplayClass3.<Handle>b__0(ICallHandler x) in d:\Git\NSubstitute\Source\NSubstitute\Routing\Route.cs: line 18
at System.Linq.Enumerable.<>c__DisplayClass12`3.<CombineSelectors>b__11(TSource x)
at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()
at System.Linq.Enumerable.FirstOrDefault(IEnumerable`1 source, Func`2 predicate)
at NSubstitute.Routing.Route.Handle(ICall call) in d:\Git\NSubstitute\Source\NSubstitute\Routing\Route.cs: line 18
at NSubstitute.Core.CallRouter.Route(ICall call) in d:\Git\NSubstitute\Source\NSubstitute\Core\CallRouter.cs: line 51
at NSubstitute.Proxies.CastleDynamicProxy.CastleForwardingInterceptor.Intercept(IInvocation invocation) in d:\Git\NSubstitute\Source\NSubstitute\Proxies\CastleDynamicProxy\CastleForwardingInterceptor.cs: line 20
at Castle.DynamicProxy.AbstractInvocation.Proceed() in c:\TeamCity\buildAgent\work\f0c43d96621436a8\src\Castle.Core\DynamicProxy\AbstractInvocation.cs: line 163
at Castle.Proxies.IFooProxy.add_ActionComplete(EventHandler`1 value)
at Cochlear.SimpleFit.UnitTests.Services.ComfortCheck.Activity.ComfortCheckActivityFixtures.Booyah.ShouldJustWork() in Booyah.cs: line 44 

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    [TestFixture]
    public class Booyah
    {
        public interface IFoo
        {
            event EventHandler<AsyncCompletedEventArgs> ActionComplete;
        }

        public class Bar
        {
            private readonly IFoo _foo;

            public Bar(IFoo foo)
            {
                _foo = foo;
            }

            public void Subscribe()
            {
                _foo.ActionComplete += HandleActionComplete;
            }

            private void HandleActionComplete(object sender, AsyncCompletedEventArgs e)
            {
                _foo.ActionComplete -= HandleActionComplete;
            }
        }

        [Test]
        public void ShouldJustWork()
        {
            var foo = Substitute.For<IFoo>();
            var bar = new Bar(foo);

            bar.Subscribe();

            foo.ActionComplete += Raise.Event(new AsyncCompletedEventArgs(null, false, null));

            foo.ReceivedWithAnyArgs().ActionComplete -= null;
        }
    }