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When disposed, the System.Net.Http.DelegatingHandler does not check whether the InnerHandler is set before calling Dispose, which raises NullReferenceException.
The following illustrates the issue:
class TestHandler : System.Net.Http.DelegatingHandler
static void Main(string args)
var handler = new TestHandler();
This behaviour deviates from the Microsoft implementation which throws no exception.
A simple fix would be to check whether the property is null before dereferencing and disposing.
Fixed in master